Images didn't load correctly when the following scenario occurred:
* ApplicationHolder#request
* MessagesActivity.SelectApplicationAndUpdateMessages#execute
* MessagesActivity.SelectApplicationAndUpdateMessages#doInBackground
- method returns List<MessageWithImage>, but images are "null" because
apps aren't loaded yet.
* MessagesActivity#onUpdateApps
- Now apps were loaded and cached.
* MessagesActivity.SelectApplicationAndUpdateMessages#onPostExecute
- receives List<MessageWithImage> from #doInBackgroud with "null" images
-> Messages with "null" images are rendered in the ListView
f713ba4915