[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   
Milestone:  Patches Needing Review  |       Component:  XMPP  
  Version:  2.5.5                   |      Resolution:        
 Keywords:  xhtml                   |   Launchpad_bug:        
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Comment(by QuLogic):

 I assume this is OK, but it looks like you're calling
 `purple_markup_html_to_xhtml` on a different string than in the original
 code?

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Ticket URL: <http://developer.pidgin.im/ticket/8738#comment:2>
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