only show reply form if the user can reply

app/models.py

@@ -61,14 +61,14 @@ class Users(Model):
                 subscriptions.user_id = ?"""
         return db.query(q, self.id)
 
-    def can_post_to_topic(self, topic):
+    def can_post_to_thread_or_topic(self, thread_or_topic):
         if self.is_guest():
             return False
 
         if self.is_mod():
             return True
 
-        if topic['is_locked']:
+        if thread_or_topic['is_locked']:
             return False
 
         return True