:bug:Fix course slug check for /teachers/courses tests
:bug:Fix course slug check for /teachers/courses tests

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