Accept updated ungraded assignments
Accept updated ungraded assignments

In our array of allowed submission types, we were missing the option for
"not_graded", which was causing the API call to fail.

Fixes CNVS-14935

Test Plan:
    - as a teacher
    - create a new assignment using the 'more options' link
    - set grading type to 'Not graded'
    - verify that the assignment saves

Change-Id: I382b669f6064d925d70a6533c4e3b2b938dec76d
Reviewed-on: https://gerrit.instructure.com/40033
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Cameron Sutter <853bcc0cb8f5834b7805e8eb9a762054be43c731@instructure.com>
QA-Review: Amber Taniuchi <ef4bfd1e6d278f6bc7d4a478f02be2cb9581a0a5@instructure.com>
Product-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>

Jyaasa/canvas-lms,SwinburneOnline/canvas-lms,fronteerio/canvas-lms,samuels410/greatlakes-lms,sfu/canvas-lms,efrj/canvas-lms,jay3126/canvas-lms,sdeleon28/canvas-lms,redconfetti/canvas-lms,venturehive/canvas-lms,shidao-fm/canvas-lms,grahamb/canvas-lms,venturehive/canvas-lms,redconfetti/canvas-lms,wye0220/shindig-canvas,roxolan/canvas-lms,juoni/canvas-lms,skmezanul/canvas-lms,kyroskoh/canvas-lms,leftplusrightllc/canvas-lms,wrdsb/canvas-lms,Rvor/canvas-lms,jay3126/canvas-lms,ShreniiNepal/shrenii_lmp,jay3126/canvas-lms,wrdsb/canvas-lms,antoniuslin/canvas-lms,sfu/canvas-lms,skmezanul/canvas-lms,sdeleon28/canvas-lms,sfu/canvas-lms,sdeleon28/canvas-lms,utkarshx/canvas-lms,tgroshon/canvas-lms,wrdsb/canvas-lms,jay3126/canvas-lms,antoniuslin/canvas-lms,fronteerio/canvas-lms,djbender/canvas-lms,Jyaasa/canvas-lms,va7map/canvas-lms,wye0220/shindig-canvas,sfu/canvas-lms,Rvor/canvas-lms,roxolan/canvas-lms,greyhwndz/canvas-lms,antoniuslin/canvas-lms,skmezanul/canvas-lms,roxolan/canvas-lms,grahamb/canvas-lms,SwinburneOnline/canvas-lms,samuels410/greatlakes-lms,tgroshon/canvas-lms,sfu/canvas-lms,shidao-fm/canvas-lms,wrdsb/canvas-lms,samuels410/greatlakes-lms,kyroskoh/canvas-lms,samuels410/greatlakes-lms,whalejasmine/canvas-lms,Rvor/canvas-lms,SwinburneOnline/canvas-lms,HotChalk/canvas-lms,greyhwndz/canvas-lms,whalejasmine/canvas-lms,greyhwndz/canvas-lms,leftplusrightllc/canvas-lms,whalejasmine/canvas-lms,ShreniiNepal/shrenii_lmp,tgroshon/canvas-lms,redconfetti/canvas-lms,Jyaasa/canvas-lms,ShreniiNepal/shrenii_lmp,grahamb/canvas-lms,utkarshx/canvas-lms,tgroshon/canvas-lms,utkarshx/canvas-lms,kyroskoh/canvas-lms,efrj/canvas-lms,juoni/canvas-lms,sdeleon28/canvas-lms,leftplusrightllc/canvas-lms,roxolan/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,grahamb/canvas-lms,skmezanul/canvas-lms,kyroskoh/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,shidao-fm/canvas-lms,efrj/canvas-lms,Rvor/canvas-lms,va7map/canvas-lms,HotChalk/canvas-lms,venturehive/canvas-lms,leftplusrightllc/canvas-lms,efrj/canvas-lms,utkarshx/canvas-lms,greyhwndz/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,HotChalk/canvas-lms,antoniuslin/canvas-lms,grahamb/canvas-lms,ShreniiNepal/shrenii_lmp,Jyaasa/canvas-lms,HotChalk/canvas-lms,SwinburneOnline/canvas-lms,fronteerio/canvas-lms,juoni/canvas-lms,shidao-fm/canvas-lms,whalejasmine/canvas-lms,wye0220/shindig-canvas,va7map/canvas-lms,redconfetti/canvas-lms,va7map/canvas-lms,juoni/canvas-lms,fronteerio/canvas-lms