open struct is not a hash (yet)
open struct is not a hash (yet)

fixes CNVS-21597

test plan:
- Run application with ruby 1.9.3.
- Observe that there is no exception when using the new user dashboard.

Change-Id: I791958472836a3c4d3f59b8904253589f8f21134
Reviewed-on: https://gerrit.instructure.com/57469
Tested-by: Jenkins
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
QA-Review: Deepeeca Soundarrajan <5bcd4b623f00b7fc2942cd1c65c245b30a48a61f@instructure.com>
Product-Review: Benjamin Porter <fdd60f2e3d506934848b3d0fff79c55f544a2d47@instructure.com>

Jyaasa/canvas-lms,sdeleon28/canvas-lms,fronteerio/canvas-lms,utkarshx/canvas-lms,AndranikMarkosyan/lms,Jyaasa/canvas-lms,eCNAP/CANVAS,instructure/canvas-lms,Rvor/canvas-lms,dgynn/canvas-lms,redconfetti/canvas-lms,tgroshon/canvas-lms,tgroshon/canvas-lms,matematikk-mooc/canvas-lms,sdeleon28/canvas-lms,matematikk-mooc/canvas-lms,SwinburneOnline/canvas-lms,sdeleon28/canvas-lms,narigone/canvas,antoniuslin/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,eCNAP/CANVAS,grahamb/canvas-lms,grahamb/canvas-lms,Rvor/canvas-lms,whalejasmine/canvas-lms,leftplusrightllc/canvas-lms,whalejasmine/canvas-lms,matematikk-mooc/canvas-lms,snehakachroo1/LSI_replica,leftplusrightllc/canvas-lms,djbender/canvas-lms,efrj/canvas-lms,whalejasmine/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,roxolan/canvas-lms,matematikk-mooc/canvas-lms,juoni/canvas-lms,whalejasmine/canvas-lms,venturehive/canvas-lms,jay3126/canvas-lms,HotChalk/canvas-lms,eCNAP/CANVAS,utkarshx/canvas-lms,roxolan/canvas-lms,jay3126/canvas-lms,fronteerio/canvas-lms,narigone/canvas,antoniuslin/canvas-lms,juoni/canvas-lms,AndranikMarkosyan/lms,grahamb/canvas-lms,narigone/canvas,dgynn/canvas-lms,Rvor/canvas-lms,dgynn/canvas-lms,kyroskoh/canvas-lms,sfu/canvas-lms,jay3126/canvas-lms,efrj/canvas-lms,sfu/canvas-lms,kyroskoh/canvas-lms,greyhwndz/canvas-lms,skmezanul/canvas-lms,HotChalk/canvas-lms,antoniuslin/canvas-lms,Jyaasa/canvas-lms,instructure/canvas-lms,skmezanul/canvas-lms,fronteerio/canvas-lms,venturehive/canvas-lms,djbender/canvas-lms,leftplusrightllc/canvas-lms,snehakachroo1/LSI_replica,juoni/canvas-lms,greyhwndz/canvas-lms,snehakachroo1/LSI_replica,instructure/canvas-lms,efrj/canvas-lms,Rvor/canvas-lms,grahamb/canvas-lms,HotChalk/canvas-lms,leftplusrightllc/canvas-lms,jay3126/canvas-lms,skmezanul/canvas-lms,sfu/canvas-lms,AndranikMarkosyan/lms,instructure/canvas-lms,narigone/canvas,sfu/canvas-lms,skmezanul/canvas-lms,sfu/canvas-lms,kyroskoh/canvas-lms,tgroshon/canvas-lms,instructure/canvas-lms,HotChalk/canvas-lms,efrj/canvas-lms,SwinburneOnline/canvas-lms,djbender/canvas-lms,eCNAP/CANVAS,juoni/canvas-lms,AndranikMarkosyan/lms,kyroskoh/canvas-lms,redconfetti/canvas-lms,snehakachroo1/LSI_replica,redconfetti/canvas-lms,SwinburneOnline/canvas-lms,greyhwndz/canvas-lms,redconfetti/canvas-lms,grahamb/canvas-lms,roxolan/canvas-lms,tgroshon/canvas-lms,venturehive/canvas-lms,sdeleon28/canvas-lms,greyhwndz/canvas-lms,dgynn/canvas-lms,antoniuslin/canvas-lms,utkarshx/canvas-lms,sfu/canvas-lms,fronteerio/canvas-lms,sfu/canvas-lms,Jyaasa/canvas-lms,utkarshx/canvas-lms,roxolan/canvas-lms