[Pidgin] #8810: XMPP: Unable to unset topic (set topic to "")

[Pidgin]

#8810: XMPP: Unable to unset topic (set topic to "")
----------------------------+-----------------------------------------------
     Reporter:  darkrain42  |       Owner:  darkrain42
         Type:  defect      |      Status:  new       
    Milestone:              |   Component:  XMPP      
      Version:  2.5.5       |    Keywords:  chat topic
Launchpad_bug:              |  
----------------------------+-----------------------------------------------
 The XMPP prpl doesn't have the ability to set the topic to an empty
 string. The prpl `set_chat_topic` prpl function (`jabber_chat_set_topic`)
 calls `jabber_chat_change_topic`, which is also called by
 `jabber_cmd_chat_topic` (for /topic).

 `jabber_chat_change_topic`, if the topic string is empty, prints the
 current topic in the chat window.

 These functions need to be refactored a little so that /topic maintains
 its current behavior while fixing set_chat_topic.

-- 
Ticket URL: <http://developer.pidgin.im/ticket/8810>
Pidgin <http://pidgin.im>
Pidgin