fix tag create

api/tag.py

@@ -54,15 +54,15 @@ class TagUpdateOrCreateView(APIView):
         tagtypes = list(set(map(lambda x: x.split(":")[0], json.loads((request.POST.get('tagtypes', '[]'))))))
         data = {
             'name': request.POST.get('name').lower(),
-            'description': request.POST.get('description'),
+            'description': request.POST.get('description', ''),
             'down_tags': down_tags,
             'up_tags': up_tags,
             'tagtypes': tagtypes,
             'icon_url': request.POST.get('icon_url', '')[:-2],
-            'platform': request.POST.get('platform'),
-            'collection': request.POST.get('collection'),
-            'alias': request.POST.get('alias'),
-            'is_show_in_register': request.POST.get('is_show_in_register')
+            'platform': request.POST.get('platform', 1),
+            'collection': request.POST.get('collection', 0),
+            'alias': request.POST.get('alias', ''),
+            'is_show_in_register': request.POST.get('is_show_in_register', 'false')
         }
         try:
             data = self.rpc['venus/sun/tag/edit'](id=id, data=data).unwrap()