Bookmarks: Fix a script error when deleting multiple folders.

When deleting multiple folders we get callback after each remove and this can trigger a selection change which in turn triggers a call to getSubtree for a folder that was just removed. When this happens we finish the Promise with the value undefined.

BUG=None
TEST=Create two folders and select both. Hit Delete and check that we do not get a script error. (We still get an error from the extension API that the id no longer exists but at least we do not keel over.

Review URL: http://codereview.chromium.org/2647001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@48938 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 1 insertions, 2 deletions

diff --git a/chrome/browser/resources/bookmark_manager/js/bmm.js b/chrome/browser/resources/bookmark_manager/js/bmm.js
index b02d850..f3d824aa 100644
--- a/chrome/browser/resources/bookmark_manager/js/bmm.js
+++ b/chrome/browser/resources/bookmark_manager/js/bmm.js
@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 cr.define('bmm', function() {
-  const TreeIterator = bmm.TreeIterator;
   const Promise = cr.Promise;
 
   /**
@@ -44,7 +43,7 @@ cr.define('bmm', function() {
       loadingPromises[id] = new Promise;
       chrome.experimental.bookmarkManager.getSubtree(id, false,
                                                      function(nodes) {
-        loadingPromises[id].value = nodes[0];
+        loadingPromises[id].value = nodes && nodes[0];
         delete loadingPromises[id];
       });
     }