Test if a character is in the font

try_char_demo.jsx

var tf = app.activeDocument.pages.item(0).textFrames.item(0);
for(var i = 0; i < tf.characters.length;i++){
var theChar = tf.characters.item(i);
try_char (theChar);
};

// original function by Peter Kahrel 
// http://www.kahrel.plus.com/indesign/compose_cs3.jsx
// edited by fabiantheblind
function try_char (theChar){  
try {  
 	// save the character 
		var storage = theChar.contents; 
 	// create outline  
 	theChar.createOutlines();  
 	// if we got here it worked, so delete the outline
 	// if not the next line will be within the catch block  
    // if not it will cause an error  
 	theChar.remove();  
 	// insert the character (again)  
 	theChar.contents = storage;  
 	} catch(e){  
 	alert("The character "+ theChar.contents + 
 	" could not be converted into an Outline.\n"+
 	"That means he does not exist in the font:\n\""
 	+ theChar.appliedFont.name+"\"");
 	}  
 } 

This Gist is part of MT4D coming soon on fabiantheblind.info