fix assignment group hiding, closes #3800
fix assignment group hiding, closes #3800

Change-Id: I4a7ebbdec04aa06991a3be580a793993139b5dbe
Reviewed-on: https://gerrit.instructure.com/2444
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>

samuels410/greatlakes-lms,eCNAP/CANVAS,sfu/canvas-lms,parbros/red-innovadores-lms,landonwilkins/canvas-lms,icelab/canvas,va7map/canvas-lms,SwinburneOnline/canvas-lms,sfu/canvas-lms,merichar/canvas-lms,snehakachroo1/LSI_replica,djbender/canvas-lms,narigone/canvas,kyroskoh/canvas-lms,jay3126/canvas-lms,HotChalk/canvas-lms,arrivu/hoodemo,usmschuck/canvas,arrivu/jigsaw-lms,landonwilkins/canvas-lms,skmezanul/canvas-lms,faraazkhan/canvas,wye0220/shindig-canvas,venturehive/canvas-lms,wimemx/Canvas,sfu/canvas-lms,sli7246/canvas_branch,efrj/canvas-lms,eCNAP/CANVAS,dgynn/canvas-lms,skmezanul/canvas-lms,Unow/canvas-lms,tgroshon/canvas-lms,shidao-fm/canvas-lms,grahamb/canvas-lms,landonwilkins/canvas-lms,AndranikMarkosyan/lms,em2/canvas-lms,samuels410/greatlakes-lms,sdeleon28/canvas-lms,va7map/canvas-lms,ottenhoff/canvas-lms,ShreniiNepal/shrenii_lmp,samuels410/greatlakes-lms,efrj/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,tgroshon/canvas-lms,AndranikMarkosyan/lms,fronteerio/canvas-lms,instructure/canvas-lms,ShreniiNepal/shrenii_lmp,SwinburneOnline/canvas-lms,sfu/canvas-lms,arrivu/arrivu-lms,arrivu/jigsaw-lms,instructure/canvas-lms,instructure/canvas-lms,djbender/canvas-lms,antoniuslin/canvas-lms,ottenhoff/canvas-lms,instructure/canvas-lms,arrivu/qibla-ecampus,Jyaasa/canvas-lms,wimemx/Canvas,merichar/canvas-lms,Jyaasa/canvas-lms,Rvor/canvas-lms,landonwilkins/canvas-lms,whalejasmine/canvas-lms,ottenhoff/canvas-lms,shidao-fm/canvas-lms,parbros/red-innovadores-lms,wye0220/shindig-canvas,juoni/canvas-lms,sdeleon28/canvas-lms,utkarshx/canvas-lms,utkarshx/canvas-lms,nditech/red-innovadores-lms,loganrun/pincan,narigone/canvas,greyhwndz/canvas-lms,arrivu/hoodemo,icelab/canvas,arrivu/hoodemo,grahamb/canvas-lms,kyroskoh/canvas-lms,fronteerio/canvas-lms,juoni/canvas-lms,greyhwndz/canvas-lms,sli7246/canvas_branch,whalejasmine/canvas-lms,matematikk-mooc/canvas-lms,arrivu/qibla-ecampus,matematikk-mooc/canvas-lms,usmschuck/canvas,ankithbti/canvas_lms,va7map/canvas-lms,arrivu/arrivu-lms,antoniuslin/canvas-lms,gbleydon/canvas-lms,Rvor/canvas-lms,snehakachroo1/LSI_replica,Jyaasa/canvas-lms,em2/canvas-lms,ShreniiNepal/shrenii_lmp,utkarshx/canvas-lms,Unow/ins,roxolan/canvas-lms,sdeleon28/canvas-lms,rup/Tarrax,Rvor/canvas-lms,nditech/red-innovadores-lms,faraazkhan/canvas,wrdsb/canvas-lms,wrdsb/canvas-lms,venturehive/canvas-lms,SwinburneOnline/canvas-lms,tgroshon/canvas-lms,rup/Tarrax,ankithbti/canvas_lms,shidao-fm/canvas-lms,faraazkhan/canvas,greyhwndz/canvas-lms,antoniuslin/canvas-lms,arrivu/arrivu-lms,wye0220/shindig-canvas,sfu/canvas-lms,eCNAP/CANVAS,dgynn/canvas-lms,ShreniiNepal/shrenii_lmp,redconfetti/canvas-lms,nditech/red-innovadores-lms,arrivu/jigsaw-lms,sfu/canvas-lms,HotChalk/canvas-lms,Unow/canvas-lms,skmezanul/canvas-lms,efrj/canvas-lms,Rvor/canvas-lms,samuels410/greatlakes-lms,nditech/red-innovadores-lms,jay3126/canvas-lms,efrj/canvas-lms,redconfetti/canvas-lms,sli7246/canvas_branch,narigone/canvas,matematikk-mooc/canvas-lms,gbleydon/canvas-lms,juoni/canvas-lms,antoniuslin/canvas-lms,arrivu/hiring-site,jay3126/canvas-lms,redconfetti/canvas-lms,usmschuck/canvas,whalejasmine/canvas-lms,Jyaasa/canvas-lms,narigone/canvas,instructure/canvas-lms,Unow/ins,wrdsb/canvas-lms,ankithbti/canvas_lms,leftplusrightllc/canvas-lms,greyhwndz/canvas-lms,utkarshx/canvas-lms,grahamb/canvas-lms,dgynn/canvas-lms,leftplusrightllc/canvas-lms,venturehive/canvas-lms,loganrun/pincan,instructure/canvas-lms,gbleydon/canvas-lms,wimemx/Canvas,roxolan/canvas-lms,tgroshon/canvas-lms,arrivu/hiring-site,whalejasmine/canvas-lms,sdeleon28/canvas-lms,redconfetti/canvas-lms,matematikk-mooc/canvas-lms,wrdsb/canvas-lms,djbender/canvas-lms,roxolan/canvas-lms,parbros/red-innovadores-lms,jay3126/canvas-lms,leftplusrightllc/canvas-lms,snehakachroo1/LSI_replica,merichar/canvas-lms,snehakachroo1/LSI_replica,sfu/canvas-lms,loganrun/pincan,HotChalk/canvas-lms,djbender/canvas-lms,fronteerio/canvas-lms,Unow/ins,eCNAP/CANVAS,leftplusrightllc/canvas-lms,fronteerio/canvas-lms,HotChalk/canvas-lms,icelab/canvas,em2/canvas-lms,AndranikMarkosyan/lms,arrivu/hiring-site,roxolan/canvas-lms,va7map/canvas-lms,AndranikMarkosyan/lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,dgynn/canvas-lms,kyroskoh/canvas-lms,venturehive/canvas-lms,kyroskoh/canvas-lms,arrivu/qibla-ecampus,rup/Tarrax,usmschuck/canvas,skmezanul/canvas-lms,shidao-fm/canvas-lms,juoni/canvas-lms,Unow/canvas-lms