[Pidgin] #10938: Blist theme.xml causes blist background to default to black.

[Pidgin]

#10938: Blist theme.xml causes blist background to default to black.
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 Reporter:  Cobalt            |        Owner:              
     Type:  defect            |       Status:  new         
Milestone:                    |    Component:  pidgin (gtk)
  Version:  2.6.4             |   Resolution:              
 Keywords:  buddy list theme  |  
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Comment(by darkrain42):

 Missing color attributes are defaulted via memset to all zeroes.
 gtkblist.c has the facilities to handle NULL GdkColor*s in at least one
 place I checked, so these should probably be left unset if not specified
 by the theme.

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Ticket URL: <http://developer.pidgin.im/ticket/10938#comment:1>
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