fix($emplateRequest): propagate rejection reason when ignoreRequestError flag is set

Closes #10266

src/ng/templateRequest.js

@@ -48,12 +48,12 @@ function $TemplateRequestProvider() {
           return html;
         }, handleError);
 
-      function handleError() {
+      function handleError(resp) {
         self.totalPendingRequests--;
         if (!ignoreRequestError) {
           throw $compileMinErr('tpload', 'Failed to load template: {0}', tpl);
         }
-        return $q.reject();
+        return $q.reject(resp);
       }
     }