Don't do anything when a team doesn't have a user.
Don't do anything when a team doesn't have a user.

hjdarnel/slack-gamebot,dblock/slack-gamebot,hjdarnel/slack-gamebot,dblock/slack-gamebot,AlexLaviolette/slack-gamebot,michael-pratt/slack-gamebot,michael-pratt/slack-gamebot,AlexLaviolette/slack-gamebot,hjdarnel/slack-gamebot,AlexLaviolette/slack-gamebot,dblock/slack-gamebot,michael-pratt/slack-gamebot,michael-pratt/slack-gamebot,hjdarnel/slack-gamebot,dblock/slack-gamebot,AlexLaviolette/slack-gamebot