moderation: fixed moving a post to another topic

app/routes/posts/edit.py

@@ -166,7 +166,9 @@ def move_post(postid):
 
     move_form = MovePost(prefix="move_")
     search_form = SearchThread(prefix="thread_")
-    keyword = search_form.name.data if search_form.validate_on_submit() else ""
+
+    # There is a bug with validate_on_submit
+    keyword = search_form.name.data if search_form.search.data else ""  
 
     # Get 10 last corresponding threads
     # TODO: add support for every MainPost