 				//if the path is relative, path.resolve() will give us the
 				//absolute path
 				this._airDescriptor = path.resolve(configData[ASConfigFields.APPLICATION]);
-				if(this._airDescriptor !== null &&
+				if(this._airDescriptor &&
 					(!fs.existsSync(this._airDescriptor) || fs.statSync(this._airDescriptor).isDirectory()))
 				{
 					console.error("Adobe AIR application descriptor not found: " + this._airDescriptor);

			for(var i:int = 0; i < jarNamesCount; i++)
			{
				var jarName:String = jarNames[i];
				if(this._isSWF)
				{
					jarPath = path.join(this._flexHome, "lib", jarName);
				}
				else
				{
					jarPath = path.join(this._flexHome, "js", "lib", jarName);
				}
				if(fs.existsSync(jarPath))
				{

				return;
			}
			var sourcePaths:Vector.<String> = null;
			if(this._sourcePaths)
			{
				sourcePaths = this._sourcePaths.slice();
			}
