Bug 1297466 - Do not attempt to open Function.prototype in Debugger. r=bgrins

--HG--
extra : rebase_source : fed13d5c980f853c313d6b62a7812af538bd79cb

devtools/client/webconsole/console-output.js

@@ -2705,10 +2705,10 @@ Widgets.ObjectRenderers.add({
 
   _onClick: function () {
     let location = this.objectActor.location;
-    if (location && IGNORED_SOURCE_URLS.indexOf(location.url) === -1) {
+    let url = location && location.url;
+    if (url && IGNORED_SOURCE_URLS.indexOf(url) === -1) {
       this.output.openLocationInDebugger(location);
-    }
-    else {
+    } else {
       this.openObjectInVariablesView();
     }
   }

devtools/client/webconsole/test/browser_console_variables_view.js

@@ -40,6 +40,30 @@ add_task(function* () {
   }], { webconsole: hud });
 });
 
+add_task(function* () {
+  yield loadTab(TEST_URI);
+
+  hud = yield openConsole();
+
+  let msg = yield hud.jsterm.execute("Function.prototype");
+
+  ok(msg, "output message found");
+  ok(msg.textContent.includes("function ()"),
+                              "message text check");
+
+  executeSoon(() => {
+    EventUtils.synthesizeMouse(msg.querySelector("a"), 2, 2, {}, hud.iframeWindow);
+  });
+
+  let varView = yield hud.jsterm.once("variablesview-fetched");
+  ok(varView, "object inspector opened on click");
+
+  yield findVariableViewProperties(varView, [{
+    name: "constructor",
+    value: "Function()",
+  }], { webconsole: hud });
+});
+
 add_task(function* () {
   let msg = yield hud.jsterm.execute("fooObj");