Avoid upgrading blank files

sickbeard/databases/mainDB.py

@@ -433,6 +433,9 @@ class AddSizeAndSceneNameFields(FixAirByDateSetting):
         
         logger.log(u"Adding file size to all episodes in DB, please be patient")
         for cur_ep in ep_results:
+            if not cur_ep["location"]:
+                continue
+            
             # if there is no size yet then populate it for us
             if not cur_ep["file_size"] or (not int(cur_ep["file_size"]) and ek.ek(os.path.isfile, cur_ep["location"])):
                 cur_size = ek.ek(os.path.getsize, cur_ep["location"])