another edge case fix for sharedClassroom
another edge case fix for sharedClassroom

my fault. should use prev commit to fix it..
codecombat/codecombat,codecombat/codecombat,javatlacati/codecombat,javatlacati/codecombat,codecombat/codecombat,javatlacati/codecombat,javatlacati/codecombat,javatlacati/codecombat,codecombat/codecombat,codecombat/codecombat