More TypeError fixing in update_port_postcommit() #127
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In some cases update_port_postcommit() gets two old segments, but the second segment can be None, apparently. This, again, leads us to a TypeError, as we try to find out if 'network_id' is in None.
Well, now we check if the segment is none beforehand and even make the core a bit shorter by giving the original bindings a name.