Maybe that's not bug,but that's pretty uncomfortable.
Some Information about bug :
It appeared after terraria update.
Steps to reproduce:
1.Open war table at any time
2.See no games.
3.Choise somethin' to see games.
Here's 2 ways as for me:
If I just opened war table i wanna see all maps.
If i seen an error when tryed to join any of map i choised - i wanna see same list as i choised before and do not choise concrete map or all "any map" one more time.