[Telepathy] Gabble do not return from RequestAliases

[Xavier Claessens]

Attached is a patch to fix RequestAliases in gabble. If the alias is
already in queue it shouldn't increment pending_vcard_requests since
it's not goint to be requested. That means that if there is one alias
cached the counter won't reach 0 and gabble never return from the DBus
call.

Xavier Claessens.
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