fix scopes loading when serializing
fix scopes loading when serializing

rails 2 doesn't know about respond_to_missing? in ruby 1.9, so
Marshal.dump(User.where("syntax error")) calls respond_to?, which
chains to respond_to_missing?, which Rails 2 delegated to proxy_found,
thinking it was a useful instance method from Array

simply removing the delegated method and letting the default
implementation return false is sufficient

Change-Id: I6fe4b4daf5fa5b4a4489c8aedaa711945bb764ed
Reviewed-on: https://gerrit.instructure.com/28906
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
Reviewed-by: Nick Cloward <9cc571ed222c7ca8c35f018ff48a612f8cadeb73@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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