:bug:Fix disappearing classroom student progress
:bug:Fix disappearing classroom student progress

JIT course instances were not getting the sessionsByUser mapping in
some cases.

probil/codecombat,icodegame/codecombat,MonkStrom/codecombat,kidaa/codecombat,differentmatt/codecombat,UltCombo/codecombat,jeremiahyan/codecombat,edtrist/codecombat,jeremiahyan/codecombat,aashaka/codecombat,Zerrien/codecombat,javatlacati/codecombat,fabichoi/codecombat,MonkStrom/codecombat,codecombat/codecombat,bsmr-x-script/codecombat,probil/codecombat,VilkkuV/codecombat,UltCombo/codecombat,icodegame/codecombat,jeremiahyan/codecombat,probil/codecombat,Zerrien/codecombat,jeremiahyan/codecombat,edtrist/codecombat,fabichoi/codecombat,MonkStrom/codecombat,zhangxiuquan/codecombat,zhangxiuquan/codecombat,UltCombo/codecombat,zhangxiuquan/codecombat,kidaa/codecombat,jacobakkerboom/codecombat,aashaka/codecombat,jeremyprice/codecombat,kidaa/codecombat,icodegame/codecombat,jeremyprice/codecombat,VilkkuV/codecombat,probil/codecombat,khoa102/codecombat,javatlacati/codecombat,edtrist/codecombat,weevilgenius/codecombat,VilkkuV/codecombat,zhangxiuquan/codecombat,nimda7/codecombat,codecombat/codecombat,jeremyprice/codecombat,javatlacati/codecombat,javatlacati/codecombat,Minhir/codecombat,icodegame/codecombat,nimda7/codecombat,MonkStrom/codecombat,duybkict/codecombat,jacobakkerboom/codecombat,weevilgenius/codecombat,codecombat/codecombat,bsmr-x-script/codecombat,tpai/codecombat,Zerrien/codecombat,weevilgenius/codecombat,jacobakkerboom/codecombat,Minhir/codecombat,tpai/codecombat,tpai/codecombat,khoa102/codecombat,duybkict/codecombat,weevilgenius/codecombat,nimda7/codecombat,jacobakkerboom/codecombat,kidaa/codecombat,javatlacati/codecombat,fabichoi/codecombat,fabichoi/codecombat,UltCombo/codecombat,khoa102/codecombat,aashaka/codecombat,codecombat/codecombat,nimda7/codecombat,differentmatt/codecombat,edtrist/codecombat,Zerrien/codecombat,aashaka/codecombat,bsmr-x-script/codecombat,Minhir/codecombat,khoa102/codecombat,jeremyprice/codecombat,bsmr-x-script/codecombat,differentmatt/codecombat,VilkkuV/codecombat,differentmatt/codecombat,duybkict/codecombat,duybkict/codecombat,codecombat/codecombat,tpai/codecombat,Minhir/codecombat