Patch: pop3_get_message works without setting an exception

[Jose Dapena Paz <jdapena igalia com>]

	Hi,

	This is for making pop3_get_message work better if no exception has
been set.

Changelog entry:
* libtinymail-camel/camel-lite/camel/providers/pop3/camel-pop3-folder.c:
  (pop3_get_message). Now it works even if no exception parameter is 
  passed.
-- 
Jose Dapena Paz <jdapena igalia com>
Igalia