Bug 1317819 - avoid typeerror when getting debugger frames from webconsole;r=jlast

MozReview-Commit-ID: 46xtLlqQnfn

--HG--
extra : rebase_source : 26b662b88b95fa9089132ea3517cd2cae6c7413a

devtools/client/debugger/new/panel.js

@@ -49,8 +49,8 @@ DebuggerPanel.prototype = {
   getFrames: function() {
     let frames = this._selectors().getFrames(this._getState());
 
-    // frames is an empty array when the debugger is not paused
-    if (!frames.toJS) {
+    // frames is null when the debugger is not paused
+    if (!frames) {
       return {
         frames: [],
         selected: -1