test(compileSpec): fix broken build on FF

FF 26.0 now throws:

"TypeError: NodeList doesn't have an indexed property setter."

when we try to assign to `childNodes[1]`, since this test still works properly
on Chrome and the issue being tested is not a cross-browser issues, I'm
just making the patchability check more robust instead of trying to figure
out how to make this test fully pass on FF.

Author: IgorMinar

test/ng/compileSpec.js

@@ -187,9 +187,14 @@ describe('$compile', function() {
       if (msie < 9) return;
 
       element = jqLite('<div>{{1+2}}</div>');
-      element[0].childNodes[1] = {nodeType: 3, nodeName: 'OBJECT', textContent: 'fake node'};
 
-      if (!element[0].childNodes[1]) return; //browser doesn't support this kind of mocking
+      try {
+        element[0].childNodes[1] = {nodeType: 3, nodeName: 'OBJECT', textContent: 'fake node'};
+      } catch(e) {
+      } finally {
+        if (!element[0].childNodes[1]) return; //browser doesn't support this kind of mocking
+      }
+
       expect(element[0].childNodes[1].textContent).toBe('fake node');
 
       $compile(element)($rootScope);