Fixed the following errors: * Missing image on edit * Saving error when labels are displayed * Setting first zone for items with no zone configured
Fixed the following errors:
* Missing image on edit
* Saving error when labels are displayed
* Setting first zone for items with no zone configured

edx-solutions/xblock-drag-and-drop-v2,open-craft/xblock-drag-and-drop-v2,open-craft/xblock-drag-and-drop-v2,arbrandes/xblock-drag-and-drop-v2,arbrandes/xblock-drag-and-drop-v2,edx-solutions/xblock-drag-and-drop-v2,arbrandes/xblock-drag-and-drop-v2,edx-solutions/xblock-drag-and-drop-v2,edx-solutions/xblock-drag-and-drop-v2,open-craft/xblock-drag-and-drop-v2,arbrandes/xblock-drag-and-drop-v2,open-craft/xblock-drag-and-drop-v2