Attempt to detect more false test errors.

test/backbone.html

@@ -42,6 +42,13 @@
 				}
 			};
 
+			// avoid reporting tests to Sauce Labs when script errors occur
+			if (ui.isSauceLabs) {
+				window.onerror = function(message) {
+					QUnit.config.done.length = 0;
+					global_test_results = { 'message': message };
+				};
+			}
 			// load Lo-Dash
 			if (!ui.isModularize) {
 				document.write('<script src="' + ui.buildPath + '"><\/script>');