Fix saving users with null includedCourseIDs
Fix saving users with null includedCourseIDs

fabichoi/codecombat,icodegame/codecombat,javatlacati/codecombat,Zerrien/codecombat,icodegame/codecombat,jeremiahyan/codecombat,probil/codecombat,Zerrien/codecombat,fabichoi/codecombat,VilkkuV/codecombat,VilkkuV/codecombat,kidaa/codecombat,javatlacati/codecombat,codecombat/codecombat,icodegame/codecombat,codecombat/codecombat,jeremiahyan/codecombat,kidaa/codecombat,javatlacati/codecombat,jeremiahyan/codecombat,kidaa/codecombat,VilkkuV/codecombat,codecombat/codecombat,probil/codecombat,probil/codecombat,jeremiahyan/codecombat,probil/codecombat,codecombat/codecombat,VilkkuV/codecombat,Zerrien/codecombat,kidaa/codecombat,Zerrien/codecombat,fabichoi/codecombat,javatlacati/codecombat,javatlacati/codecombat,icodegame/codecombat,fabichoi/codecombat,codecombat/codecombat