don't try and set a blank sis_user_id for pseudonyms created via the browser
don't try and set a blank sis_user_id for pseudonyms created via the browser

Change-Id: If0a88867faef6b838517d65b70b828fc80715582
Reviewed-on: https://gerrit.instructure.com/4295
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Bracken Mosbacker <48b846001bca4166dc3fb7711563afc17525921e@instructure.com>

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