fix failing user model specs
fix failing user model specs

bare_submission_model doesn't validate (#valid? returns nil!?!?) as
used here

Change-Id: I2623274156ea99c30bb67f7fc03be2757d1f1ae2
Reviewed-on: https://gerrit.instructure.com/30082
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>
QA-Review: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>

usmschuck/canvas,efrj/canvas-lms,grahamb/canvas-lms,wrdsb/canvas-lms,ShreniiNepal/shrenii_lmp,sfu/canvas-lms,skmezanul/canvas-lms,leftplusrightllc/canvas-lms,Jyaasa/canvas-lms,narigone/canvas,snehakachroo1/LSI_replica,tgroshon/canvas-lms,shidao-fm/canvas-lms,redconfetti/canvas-lms,antoniuslin/canvas-lms,matematikk-mooc/canvas-lms,HotChalk/canvas-lms,AndranikMarkosyan/lms,greyhwndz/canvas-lms,roxolan/canvas-lms,efrj/canvas-lms,whalejasmine/canvas-lms,kyroskoh/canvas-lms,antoniuslin/canvas-lms,shidao-fm/canvas-lms,narigone/canvas,kyroskoh/canvas-lms,arrivu/arrivu-lms,greyhwndz/canvas-lms,va7map/canvas-lms,Unow/canvas-lms,SwinburneOnline/canvas-lms,HotChalk/canvas-lms,venturehive/canvas-lms,sdeleon28/canvas-lms,matematikk-mooc/canvas-lms,djbender/canvas-lms,gbleydon/canvas-lms,eCNAP/CANVAS,wye0220/shindig-canvas,fronteerio/canvas-lms,fronteerio/canvas-lms,arrivu/arrivu-lms,grahamb/canvas-lms,AndranikMarkosyan/lms,sdeleon28/canvas-lms,instructure/canvas-lms,roxolan/canvas-lms,arrivu/arrivu-lms,tgroshon/canvas-lms,venturehive/canvas-lms,wrdsb/canvas-lms,gbleydon/canvas-lms,juoni/canvas-lms,usmschuck/canvas,utkarshx/canvas-lms,Rvor/canvas-lms,jay3126/canvas-lms,dgynn/canvas-lms,samuels410/greatlakes-lms,juoni/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,kyroskoh/canvas-lms,matematikk-mooc/canvas-lms,dgynn/canvas-lms,sfu/canvas-lms,HotChalk/canvas-lms,ShreniiNepal/shrenii_lmp,Unow/canvas-lms,HotChalk/canvas-lms,AndranikMarkosyan/lms,SwinburneOnline/canvas-lms,jay3126/canvas-lms,snehakachroo1/LSI_replica,venturehive/canvas-lms,eCNAP/CANVAS,sdeleon28/canvas-lms,narigone/canvas,shidao-fm/canvas-lms,Jyaasa/canvas-lms,usmschuck/canvas,arrivu/hoodemo,jay3126/canvas-lms,greyhwndz/canvas-lms,Rvor/canvas-lms,Rvor/canvas-lms,fronteerio/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,sdeleon28/canvas-lms,whalejasmine/canvas-lms,AndranikMarkosyan/lms,leftplusrightllc/canvas-lms,Jyaasa/canvas-lms,sfu/canvas-lms,arrivu/hoodemo,kyroskoh/canvas-lms,wrdsb/canvas-lms,tgroshon/canvas-lms,va7map/canvas-lms,antoniuslin/canvas-lms,va7map/canvas-lms,instructure/canvas-lms,utkarshx/canvas-lms,juoni/canvas-lms,whalejasmine/canvas-lms,efrj/canvas-lms,gbleydon/canvas-lms,djbender/canvas-lms,snehakachroo1/LSI_replica,samuels410/greatlakes-lms,utkarshx/canvas-lms,djbender/canvas-lms,jay3126/canvas-lms,wye0220/shindig-canvas,instructure/canvas-lms,roxolan/canvas-lms,skmezanul/canvas-lms,ShreniiNepal/shrenii_lmp,sfu/canvas-lms,whalejasmine/canvas-lms,wye0220/shindig-canvas,roxolan/canvas-lms,eCNAP/CANVAS,juoni/canvas-lms,ShreniiNepal/shrenii_lmp,skmezanul/canvas-lms,samuels410/greatlakes-lms,redconfetti/canvas-lms,fronteerio/canvas-lms,grahamb/canvas-lms,venturehive/canvas-lms,Unow/canvas-lms,djbender/canvas-lms,SwinburneOnline/canvas-lms,usmschuck/canvas,antoniuslin/canvas-lms,snehakachroo1/LSI_replica,sfu/canvas-lms,matematikk-mooc/canvas-lms,redconfetti/canvas-lms,shidao-fm/canvas-lms,arrivu/hoodemo,sfu/canvas-lms,Jyaasa/canvas-lms,dgynn/canvas-lms,instructure/canvas-lms,utkarshx/canvas-lms,dgynn/canvas-lms,narigone/canvas,skmezanul/canvas-lms,leftplusrightllc/canvas-lms,grahamb/canvas-lms,redconfetti/canvas-lms,efrj/canvas-lms,Rvor/canvas-lms,instructure/canvas-lms,greyhwndz/canvas-lms,leftplusrightllc/canvas-lms,eCNAP/CANVAS,va7map/canvas-lms,samuels410/greatlakes-lms,tgroshon/canvas-lms,wrdsb/canvas-lms