fix error where users without teams weren't being shown on the leaderboard if team filter wasn't active
fix error where users without teams weren't being shown on the leaderboard if team filter wasn't active

UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,mkoon/gradecraft-development,mkoon/gradecraft-development,UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,mkoon/gradecraft-development