"No opponent selected" & "No game type selected"

[Phrancis]

The Lobby needs to replicate the messages shown below (from the Java client) if "Invite to game" is pressed but either no opponent or no game type is selected (in that order). I think this is all done client-side, the server does not receive any start game message while one option is not selected for either of the required selections.

[Phrancis]

Partially fixed. Now displays:

[2015-8-9 12:48:16] unused: Client error: need to choose both a mod and an opponent

Just need to figure out a way to not display unused as the "from" and this will be done.