How to get a different notification after the script fails?

OK, bear with me, this one will be a long one.

I changed one of my script to move region to tracks with a specific name. here's the script:

//This script will move the content in the selected track to track named "Boom Strip 1", "Boom Strip 2", etc.

// this script need the script "Read preferences from Pro Tools Session Folder"
// and also need destination tracks named with a specific structure
// you can use the script "Create Tracks from variables" to create those specific tracks, from the preferences
// set with the script "Read preferences from Pro Tools Session Folder"



sf.ui.proTools.mainWindow.invalidate();
var num = sf.ui.proTools.selectedTrackCount    	//get the number of selected track
var track = 'Boom Strip'						//Base name of the tracks to move the clips
var names = []
var sel = sf.ui.proTools.selectionGet();
var origTrackName = sf.ui.proTools.selectedTrackNames;
var paste = 0

if (num > globalState.boomStripTracks) {		//check if you have enough destination tracks
	log('Please select less tracks');
	throw 0;
}

//populate the destination tracks array with the name of the tracks
for (var y = 1; y < (globalState.boomStripTracks + 1); y++) {
	names[(y - 1)] = [track + globalState.nameSeparation + y.toString()];
}

// cycle: it will the selected region in each track, and for each track it will cycle to find an empy spot 
// on the destination tracks to copy the material. After copying the material il will delete the selection in the source track
for (var i = 0; i < num; i++) {
	sf.ui.proTools.trackSelectByName({ names: [origTrackName[i]] });
	sf.ui.proTools.selectionSet({ selectionLength: sel.selectionLength });
	// sf.wait({ intervalMs: 100 });
	sf.ui.proTools.menuClick({ menuPath: ['Edit', 'Copy'] });
	paste = 1
	var j = 0
	// sf.wait({ intervalMs: 100 });

	while (paste != 0) {
		sf.ui.proTools.trackSelectByName({
			names: names[j],
			deselectOthers: true,
		});
		sf.ui.proTools.selectionSet({ selectionLength: sel.selectionLength });
		sf.keyboard.press({
			keys: 'left'
		});
		if (sf.ui.proTools.getMenuItem('Edit', 'Fades').isEnabled) {
			j++;
		}
		else {
			sf.ui.proTools.menuClick({ menuPath: ['Edit', 'Paste'] });
			sf.ui.proTools.trackSelectByName({ names: [origTrackName[i]] });
			sf.ui.proTools.selectionSet({ selectionLength: sel.selectionLength });
			sf.ui.proTools.menuClick({ menuPath: ['Edit', 'Clear'] });
			paste = 0
		};
	};


}

the issue that I have is that if the script doesn't find an empty track to copy the material, SF will give an error.
I'm fine with that, but I would like to have a better log instead, more user friendly.
How can I do that?

btw, before running the script above you need to run the script below (to populate the global variables, used in the script above)

// This script reads a tab delimited file and set globalstate variables to the values written in the file.
// The text file is jsut a TAB delimited file (so use a TAB after the name), but I decided to use a different extension (.dfp)
// to be sure that SF read the correct file. Obviously you can change that in the extCheck variable.
// This script looks in the text file for the names that match the switch/case statement, and assign those values to globalstate variables.
// My text file that matches this script look like this:
// 
// boomstrip    1
// radiostrip   1
// fill 1
// toadr    1
// untreated    1
// orig 1 
// edit 1
// option   1
// separation   _
// 
// This file will set all the variables below (that are set to default state at the beginning of the script) to 1.

var sessionPath = sf.ui.proTools.mainWindow.sessionPath;
var sessionDir = sessionPath.split('/').slice(0, -1).join('/');
var fullPath = sessionDir + '/settings.dfp';

var i
var x

// defualt values
globalState.boomStripTracks = 4
globalState.radioStripTracks = 6
globalState.fillTracks = 2
globalState.toBeAdrTracks = 6
globalState.untreatedTracks = 8
globalState.origTracks = 4
globalState.editTracks = 4
globalState.optionTracks = 2
globalState.nameSeparation = ' '

if (!sf.file.exists({ path: fullPath }).exists) {
    log('Error', 'Could not find a settings.dfp in the current session\'s folder');
    sf.wait({intervalMs: 1500})
    log('Loading default values', '');
    throw 0; //exit script now
}

var nameList = sf.file.readLines({
    path: fullPath
}).lines;

for (i = 0; i < nameList.length; i++) {
    var thisLine = nameList[i];
    var lineArray = thisLine.split('\t');
    switch (lineArray[0]) {
        case 'boomstrip':
            globalState.boomStripTracks = parseInt(lineArray[1]);
            break;
        case 'radiostrip':
            globalState.radioStripTracks = parseInt(lineArray[1]);
            break;
        case 'fill':
            globalState.fillTracks = parseInt(lineArray[1]);
            break;
        case 'toadr':
            globalState.toBeAdrTracks = parseInt(lineArray[1]);
            break;
        case 'untreated':
            globalState.untreatedTracks = parseInt(lineArray[1]);
            break;
        case 'edit':
            globalState.editTracks = parseInt(lineArray[1]);
            break;
        case 'separation':
            globalState.nameSeparation = lineArray[1];
            break;
        case 'option':
            globalState.optionTracks = parseInt(lineArray[1]);
            break;
        case 'orig':
            globalState.origTracks = parseInt(lineArray[1]);
    }

}

log('Boom Strips tracks:', globalState.boomStripTracks.toString());
log('Radio Strips tracks:', globalState.radioStripTracks.toString());
log('Fill tracks:', globalState.fillTracks.toString());
log('To Be ADR tracks:', globalState.toBeAdrTracks.toString());
log('Untreated tracks:', globalState.untreatedTracks.toString());
log('Original tracks:', globalState.origTracks.toString());
log('Edit tracks:', globalState.editTracks.toString());
log('Option tracks:', globalState.optionTracks.toString());

And also you can use the following script to create the needed tracks, after you run the script above to populate the global variables.

function createTracks(numtracks, baseName, active, colBright, colNum) {
	for (var x = 0; x < numtracks; x++) {

		//Open New Track dialog
		sf.ui.proTools.menuClick({
			menuPath: ['Track', 'New...']
		});

		//Wait for the New Track dialog, and click create in it
		var ntDlg = sf.ui.proTools.dialogWaitForManual({ dialogTitle: 'New Tracks' }).dialog;
		ntDlg.getFirstWithTitle("Create").elementClick();

		//Wait for the dialog to close again
		sf.ui.proTools.waitForNoModals();

		//Refresh SF's cache of tracks since we just added one
		sf.ui.proTools.mainWindow.invalidate();

		//Rename the selected track
		sf.ui.proTools.selectedTrack.trackRename({
			renameFunction: function (name) {
				return baseName + globalState.nameSeparation + (x + 1).toString();
			}
		});
		// Make the track inactive
		if (active == false) {
			sf.ui.proTools.menuClick({
				menuPath: ['Track', 'Make Inactive']
			});
		}
		sf.ui.proTools.colorsSelect({
			colorBrightness: colBright,
			colorNumber: colNum,
			colorTarget: 'Tracks'
		})
	}
}

// createTracks(globalState.fillTracks, 'FILL', false, 'Light', 20);
// createTracks(globalState.editTracks, 'EDIT', true, 'Light', 12);
createTracks(globalState.boomStripTracks, 'Boom Strip', false, 'Dark', 23);
// createTracks(globalState.radioStripTracks, 'Radio Strip', false, 'Dark', 23);
//  createTracks(globalState.toBeAdrTracks, 'ToBeADR', false, 'Dark', 23 );
//createTracks(globalState.untreatedTracks, 'Untreated', false, 'Dark', 23);
// createTracks(globalState.origTracks, 'ORIG', false, 'Dark', 23);
//createTracks(globalState.optionTracks, 'Optional', false, 'Dark', 23);

Sorry, you have to un-comment the last block to create more block of tracks: I have yet to find a better way to do that.