rating bug on team detail page

[wimglenn]

Rating modified even if "Result of match is unknown". See e.g. https://royalpalms.shuff.io/teams/47

[kevinreedy]

@wimglenn I somehow missed your issues. Sorry about that! I'll get to them after banquet.

I'm cooking up something fun for banquet, a /live endpoint that shows the live results of two games. Let me know if you have time to help out this week. I'll be documenting issues over in https://github.com/kevinreedy/shuffio/milestone/1.