fix create topic video_url

api/topic.py

@@ -61,7 +61,7 @@ class TopicUpdateOrCreateView(APIView):
             'is_online': int(request.POST.get('is_online')),
             'drop_score': int(request.POST.get('drop_score')),
             'has_image': 1 if topic_images else 0,
-            'has_video': 1 if video_url else 0,
+            'has_video': 1 if request.POST.get('video_url', '') else 0,
         }
         try:
             self.rpc['venus/sun/topic/edit'](id=id, data=data).unwrap()