fix ugly error message for categories during theme submission
fix ugly error message for categories during theme submission

andymckay/olympia,mstriemer/olympia,ingenioustechie/zamboni,johancz/olympia,jpetto/olympia,eviljeff/olympia,diox/olympia,bqbn/addons-server,wagnerand/zamboni,kumar303/addons-server,mdaif/olympia,ingenioustechie/zamboni,muffinresearch/addons-server,eviljeff/olympia,shahbaz17/zamboni,psiinon/addons-server,harry-7/addons-server,andymckay/addons-server,Witia1/olympia,kumar303/olympia,yfdyh000/olympia,lavish205/olympia,kumar303/olympia,Joergen/olympia,lavish205/olympia,tsl143/addons-server,andymckay/addons-server,spasovski/zamboni,mstriemer/addons-server,mozilla/addons-server,clouserw/zamboni,Witia1/olympia,mozilla/addons-server,yfdyh000/olympia,psiinon/addons-server,anaran/olympia,kmaglione/olympia,mozilla/zamboni,muffinresearch/addons-server,diox/zamboni,andymckay/addons-server,lavish205/olympia,Joergen/zamboni,mrrrgn/olympia,mdaif/olympia,Joergen/zamboni,Prashant-Surya/addons-server,washort/zamboni,ngokevin/zamboni,koehlermichael/olympia,tsl143/zamboni,wagnerand/addons-server,crdoconnor/olympia,clouserw/zamboni,SuriyaaKudoIsc/olympia,elysium001/zamboni,ddurst/zamboni,wagnerand/olympia,harry-7/addons-server,magopian/olympia,johancz/olympia,beni55/olympia,tsl143/zamboni,mstriemer/olympia,Hitechverma/zamboni,andymckay/zamboni,clouserw/zamboni,harry-7/addons-server,mozilla/addons-server,andymckay/zamboni,magopian/olympia,harry-7/addons-server,shahbaz17/zamboni,ingenioustechie/zamboni,kumar303/zamboni,Witia1/olympia,jpetto/olympia,mstriemer/zamboni,jasonthomas/zamboni,Witia1/olympia,tsl143/addons-server,bqbn/addons-server,ddurst/zamboni,mozilla/zamboni,jpetto/olympia,andymckay/olympia,robhudson/zamboni,crdoconnor/olympia,andymckay/olympia,eviljeff/zamboni,muffinresearch/olympia,mozilla/olympia,spasovski/zamboni,luckylavish/zamboni,beni55/olympia,atiqueahmedziad/addons-server,robhudson/zamboni,mdaif/olympia,eviljeff/olympia,Joergen/zamboni,muffinresearch/olympia,SuriyaaKudoIsc/olympia,Revanth47/addons-server,mstriemer/addons-server,Revanth47/addons-server,mozilla/olympia,mozilla/zamboni,tsl143/addons-server,Nolski/olympia,Prashant-Surya/addons-server,shahbaz17/zamboni,lavish205/olympia,Jobava/zamboni,mrrrgn/olympia,mstriemer/zamboni,mstriemer/zamboni,diox/olympia,crdoconnor/olympia,mozilla/addons-server,mstriemer/addons-server,atiqueahmedziad/addons-server,harikishen/addons-server,SuriyaaKudoIsc/olympia,muffinresearch/addons-server,yfdyh000/olympia,mdaif/olympia,jamesthechamp/zamboni,tsl143/addons-server,Jobava/zamboni,Hitechverma/zamboni,Joergen/zamboni,magopian/olympia,bqbn/addons-server,johancz/olympia,Nolski/olympia,muffinresearch/olympia,Joergen/olympia,eviljeff/zamboni,muffinresearch/addons-server,diox/zamboni,wagnerand/addons-server,mrrrgn/olympia,Joergen/olympia,elysium001/zamboni,Joergen/zamboni,anaran/olympia,wagnerand/olympia,jasonthomas/zamboni,washort/zamboni,luckylavish/zamboni,Joergen/zamboni,aviarypl/mozilla-l10n-addons-server,wagnerand/olympia,crdoconnor/olympia,spasovski/zamboni,kumar303/zamboni,atiqueahmedziad/addons-server,Nolski/olympia,muffinresearch/olympia,andymckay/addons-server,bqbn/addons-server,kumar303/zamboni,jamesthechamp/zamboni,ddurst/zamboni,andymckay/olympia,ngokevin/zamboni,koehlermichael/olympia,diox/olympia,beni55/olympia,ayushagrawal288/zamboni,mozilla/zamboni,crdoconnor/olympia,tsl143/zamboni,koehlermichael/olympia,Joergen/olympia,johancz/olympia,jamesthechamp/zamboni,luckylavish/zamboni,kmaglione/olympia,psiinon/addons-server,aviarypl/mozilla-l10n-addons-server,diox/zamboni,anaran/olympia,ayushagrawal288/zamboni,kumar303/addons-server,mstriemer/olympia,shahbaz17/zamboni,yfdyh000/olympia,Prashant-Surya/addons-server,Joergen/olympia,jpetto/olympia,SuriyaaKudoIsc/olympia,anaran/olympia,kumar303/olympia,magopian/olympia,washort/zamboni,magopian/olympia,kumar303/zamboni,ayushagrawal288/zamboni,mrrrgn/olympia,luckylavish/zamboni,diox/zamboni,wagnerand/addons-server,wagnerand/zamboni,psiinon/addons-server,mstriemer/addons-server,jamesthechamp/zamboni,koehlermichael/olympia,Hitechverma/zamboni,robhudson/zamboni,eviljeff/zamboni,tsl143/zamboni,washort/zamboni,aviarypl/mozilla-l10n-addons-server,Revanth47/addons-server,diox/olympia,wagnerand/addons-server,kumar303/addons-server,eviljeff/zamboni,Revanth47/addons-server,beni55/olympia,wagnerand/olympia,mudithkr/zamboni,ddurst/zamboni,mdaif/olympia,aviarypl/mozilla-l10n-addons-server,atiqueahmedziad/addons-server,spasovski/zamboni,eviljeff/olympia,harikishen/addons-server,mrrrgn/olympia,harikishen/addons-server,Witia1/olympia,Jobava/zamboni,elysium001/zamboni,Prashant-Surya/addons-server,mudithkr/zamboni,johancz/olympia,andymckay/zamboni,muffinresearch/olympia,yfdyh000/olympia,wagnerand/zamboni,Nolski/olympia,muffinresearch/addons-server,jasonthomas/zamboni,ayushagrawal288/zamboni,mozilla/olympia,mudithkr/zamboni,kmaglione/olympia,ingenioustechie/zamboni,ngokevin/zamboni,beni55/olympia,kumar303/addons-server,koehlermichael/olympia,Nolski/olympia,kmaglione/olympia,kmaglione/olympia,Jobava/zamboni,mudithkr/zamboni,wagnerand/zamboni,mozilla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