don't stop processing incoming email on a failure
don't stop processing incoming email on a failure

Change-Id: I9c8aef5a3e71bcedc179eb0172c2c4c8bc80cd85
Reviewed-on: https://gerrit.instructure.com/5230
Reviewed-by: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>

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