[Pidgin] #16831: print policy-violation instead of useless error message

[Pidgin]

#16831: print policy-violation instead of useless error message
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 Reporter:  stefan                               |       Owner:  deryni
     Type:  enhancement                          |      Status:  new
Milestone:                                       |   Component:  XMPP
  Version:  2.10.11                              |  Resolution:
 Keywords:  user experience, xmpp, error         |
  message, policy violation                      |
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Comment (by stefan):

 it seems to be reporting a misleading error message too: "You require
 encryption, but it is not available on this server."

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Ticket URL: <https://developer.pidgin.im/ticket/16831#comment:1>
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