[Pidgin] #11787: Handle empty http_proxy environment variable correcty

[Pidgin]

#11787: Handle empty http_proxy environment variable correcty
------------------------------+---------------------------------------------
 Reporter:  hpalma            |     Owner:  rekkanoryo
     Type:  defect            |    Status:  new       
Component:  unclassified      |   Version:  2.6.6     
 Keywords:  proxy http_proxy  |  
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 If i don't set the http_proxy environment variable no proxy is used as it
 should.

 But, if i do this:

 {{{
 export http_proxy=
 }}}

 i get an "Invalid proxy settings" error when i try to connect.

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Ticket URL: <http://developer.pidgin.im/ticket/11787>
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