[Pidgin] #8738: XMPP: Only send XHTML if there is markup

[Pidgin]

#8738: XMPP: Only send XHTML if there is markup
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 Reporter:  darkrain42  |           Owner:  deryni
     Type:  patch       |          Status:  new   
Component:  XMPP        |         Version:  2.5.5 
 Keywords:  xhtml       |   Launchpad_bug:        
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 Instead of always sending both a plaintext and xhtml-im body, we should
 only be sending the xhtml-im if there is differing markup.

 Attached patch does this for both IMs and chats.

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Ticket URL: <http://developer.pidgin.im/ticket/8738>
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