[fix] added check on team averages when size is 0 (no members)
[fix] added check on team averages when size is 0 (no members)

rdonnelly/ultimate-league-app,a2ultimate/ultimate-league-app,rdonnelly/ultimate-league-app,a2ultimate/ultimate-league-app,a2ultimate/ultimate-league-app,rdonnelly/ultimate-league-app,a2ultimate/ultimate-league-app,rdonnelly/ultimate-league-app