Don't fail when file name isn't mocked out.
Don't fail when file name isn't mocked out.

Poor mocking in the file viewer's helper tests causes `filename` to
sometimes not be provided.
kmaglione/olympia,elysium001/zamboni,koehlermichael/olympia,Jobava/zamboni,mstriemer/olympia,Joergen/zamboni,eviljeff/olympia,magopian/olympia,crdoconnor/olympia,harikishen/addons-server,elysium001/zamboni,mstriemer/addons-server,johancz/olympia,diox/zamboni,muffinresearch/addons-server,mozilla/zamboni,andymckay/addons-server,kumar303/olympia,Joergen/zamboni,andymckay/olympia,Joergen/olympia,magopian/olympia,shahbaz17/zamboni,diox/olympia,ayushagrawal288/zamboni,andymckay/addons-server,yfdyh000/olympia,shahbaz17/zamboni,robhudson/zamboni,tsl143/zamboni,Jobava/zamboni,clouserw/zamboni,bqbn/addons-server,mudithkr/zamboni,atiqueahmedziad/addons-server,clouserw/zamboni,kumar303/olympia,ngokevin/zamboni,crdoconnor/olympia,ingenioustechie/zamboni,mrrrgn/olympia,Witia1/olympia,spasovski/zamboni,wagnerand/zamboni,jpetto/olympia,Hitechverma/zamboni,bqbn/addons-server,shahbaz17/zamboni,washort/zamboni,diox/olympia,mudithkr/zamboni,mdaif/olympia,elysium001/zamboni,lavish205/olympia,Revanth47/addons-server,kumar303/zamboni,aviarypl/mozilla-l10n-addons-server,Revanth47/addons-server,atiqueahmedziad/addons-server,lavish205/olympia,wagnerand/olympia,koehlermichael/olympia,mstriemer/zamboni,mdaif/olympia,yfdyh000/olympia,spasovski/zamboni,wagnerand/olympia,Witia1/olympia,SuriyaaKudoIsc/olympia,kumar303/addons-server,ngokevin/zamboni,mozilla/olympia,lavish205/olympia,beni55/olympia,Nolski/olympia,tsl143/addons-server,Prashant-Surya/addons-server,mozilla/zamboni,mstriemer/olympia,muffinresearch/addons-server,spasovski/zamboni,aviarypl/mozilla-l10n-addons-server,Joergen/olympia,Joergen/olympia,ingenioustechie/zamboni,mdaif/olympia,magopian/olympia,jamesthechamp/zamboni,luckylavish/zamboni,Jobava/zamboni,Joergen/zamboni,johancz/olympia,wagnerand/addons-server,anaran/olympia,mozilla/addons-server,eviljeff/olympia,Nolski/olympia,johancz/olympia,harikishen/addons-server,lavish205/olympia,tsl143/zamboni,crdoconnor/olympia,diox/olympia,clouserw/zamboni,Prashant-Surya/addons-server,eviljeff/olympia,mrrrgn/olympia,shahbaz17/zamboni,jpetto/olympia,Revanth47/addons-server,robhudson/zamboni,wagnerand/olympia,Prashant-Surya/addons-server,mstriemer/olympia,ngokevin/zamboni,andymckay/olympia,Prashant-Surya/addons-server,anaran/olympia,kmaglione/olympia,harry-7/addons-server,jasonthomas/zamboni,kmaglione/olympia,kmaglione/olympia,mozilla/olympia,anaran/olympia,mstriemer/addons-server,luckylavish/zamboni,muffinresearch/olympia,jasonthomas/zamboni,atiqueahmedziad/addons-server,andymckay/zamboni,kumar303/addons-server,yfdyh000/olympia,muffinresearch/olympia,harry-7/addons-server,ddurst/zamboni,jamesthechamp/zamboni,andymckay/addons-server,aviarypl/mozilla-l10n-addons-server,kumar303/zamboni,SuriyaaKudoIsc/olympia,Witia1/olympia,psiinon/addons-server,psiinon/addons-server,Hitechverma/zamboni,muffinresearch/addons-server,mstriemer/zamboni,Nolski/olympia,tsl143/addons-server,anaran/olympia,mdaif/olympia,mstriemer/zamboni,mozilla/zamboni,muffinresearch/addons-server,andymckay/zamboni,wagnerand/addons-server,johancz/olympia,wagnerand/zamboni,beni55/olympia,beni55/olympia,Nolski/olympia,Revanth47/addons-server,wagnerand/zamboni,washort/zamboni,spasovski/zamboni,mozilla/addons-server,ddurst/zamboni,crdoconnor/olympia,tsl143/addons-server,andymckay/zamboni,SuriyaaKudoIsc/olympia,magopian/olympia,Joergen/olympia,koehlermichael/olympia,Joergen/olympia,wagnerand/zamboni,washort/zamboni,ingenioustechie/zamboni,bqbn/addons-server,mrrrgn/olympia,ddurst/zamboni,harikishen/addons-server,crdoconnor/olympia,wagnerand/addons-server,muffinresearch/olympia,diox/zamboni,Witia1/olympia,jpetto/olympia,psiinon/addons-server,diox/zamboni,psiinon/addons-server,andymckay/olympia,kumar303/zamboni,ayushagrawal288/zamboni,mozilla/addons-server,muffinresearch/addons-server,clouserw/zamboni,beni55/olympia,jasonthomas/zamboni,Joergen/zamboni,magopian/olympia,robhudson/zamboni,bqbn/addons-server,wagnerand/addons-server,kumar303/addons-server,johancz/olympia,mozilla/zamboni,jamesthechamp/zamboni,mstriemer/olympia,luckylavish/zamboni,andymckay/addons-server,eviljeff/zamboni,kumar303/olympia,eviljeff/olympia,luckylavish/zamboni,yfdyh000/olympia,mstriemer/addons-server,Witia1/olympia,harry-7/addons-server,ayushagrawal288/zamboni,elysium001/zamboni,jasonthomas/zamboni,jamesthechamp/zamboni,diox/olympia,mozilla/addons-server,mozilla/olympia,Hitechverma/zamboni,jpetto/olympia,Joergen/zamboni,muffinresearch/olympia,atiqueahmedziad/addons-server,ddurst/zamboni,mrrrgn/olympia,koehlermichael/olympia,mrrrgn/olympia,yfdyh000/olympia,kumar303/olympia,robhudson/zamboni,Nolski/olympia,kumar303/zamboni,kumar303/addons-server,SuriyaaKudoIsc/olympia,washort/zamboni,andymckay/olympia,mstriemer/addons-server,eviljeff/zamboni,eviljeff/zamboni,tsl143/addons-server,tsl143/zamboni,muffinresearch/olympia,ayushagrawal288/zamboni,diox/zamboni,eviljeff/zamboni,mudithkr/zamboni,ingenioustechie/zamboni,aviarypl/mozilla-l10n-addons-server,mozilla/olympia,kmaglione/olympia,koehlermichael/olympia,mudithkr/zamboni,mdaif/olympia,harikishen/addons-server,mstriemer/zamboni,wagnerand/olympia,Jobava/zamboni,harry-7/addons-server,Joergen/zamboni,tsl143/zamboni,beni55/olympia,Hitechverma/zamboni