only create screenshots if 'resources' key is in snapshot data

Author: yvess

django/gsmap/models.py

@@ -197,6 +197,8 @@ def save_screenshot():
         instance = kwargs.get('instance')
         # only create snapshot if data changed
         if instance.data_changed(['data', 'screenshot_generated', 'thumbnail_generated']):
+            if not 'resources' in instance.data:
+                return
             try:
                 # disconnect to break save recursive loop
                 post_save.disconnect(save_screenshot_handler, sender=Snapshot)