XEP-0260 <candidate port="" /> is optional

Placeholder singpolymarequested to merge
s5b-transport-port-is-optional into master

XEP-0065 specifies that the defalt is 1080.

Previously, sending Gajim a with no port would result in a backtrace, since int() does not accept NoneType. Now it will correctly fall back to the default port.

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