Fix for validator results tomfoolery
Fix for validator results tomfoolery

The `description` field of a validation message is now `null` if there
is no description for the message (for consistency). No need for such
strict type restrictions; a falsey value is an empty description
always.
kumar303/olympia,robhudson/zamboni,lavish205/olympia,luckylavish/zamboni,andymckay/addons-server,Hitechverma/zamboni,koehlermichael/olympia,ddurst/zamboni,mozilla/zamboni,diox/olympia,yfdyh000/olympia,mrrrgn/olympia,Witia1/olympia,Hitechverma/zamboni,elysium001/zamboni,Nolski/olympia,mdaif/olympia,wagnerand/addons-server,mrrrgn/olympia,mstriemer/zamboni,ingenioustechie/zamboni,atiqueahmedziad/addons-server,Jobava/zamboni,robhudson/zamboni,andymckay/zamboni,mrrrgn/olympia,johancz/olympia,mozilla/addons-server,elysium001/zamboni,Witia1/olympia,johancz/olympia,anaran/olympia,mdaif/olympia,wagnerand/olympia,washort/zamboni,eviljeff/zamboni,jpetto/olympia,wagnerand/olympia,mudithkr/zamboni,atiqueahmedziad/addons-server,jpetto/olympia,Joergen/olympia,diox/zamboni,mstriemer/zamboni,andymckay/zamboni,mozilla/addons-server,psiinon/addons-server,eviljeff/zamboni,mstriemer/olympia,lavish205/olympia,eviljeff/zamboni,Joergen/olympia,diox/zamboni,kumar303/addons-server,crdoconnor/olympia,Prashant-Surya/addons-server,Nolski/olympia,Revanth47/addons-server,Joergen/zamboni,diox/zamboni,harry-7/addons-server,diox/zamboni,Joergen/olympia,Prashant-Surya/addons-server,eviljeff/olympia,wagnerand/addons-server,muffinresearch/addons-server,bqbn/addons-server,luckylavish/zamboni,harikishen/addons-server,johancz/olympia,mstriemer/olympia,mozilla/zamboni,ingenioustechie/zamboni,shahbaz17/zamboni,Joergen/zamboni,anaran/olympia,koehlermichael/olympia,eviljeff/olympia,magopian/olympia,beni55/olympia,wagnerand/olympia,Jobava/zamboni,Nolski/olympia,crdoconnor/olympia,jamesthechamp/zamboni,mstriemer/zamboni,ayushagrawal288/zamboni,kmaglione/olympia,mozilla/addons-server,ddurst/zamboni,mstriemer/addons-server,magopian/olympia,ayushagrawal288/zamboni,muffinresearch/addons-server,wagnerand/zamboni,jasonthomas/zamboni,muffinresearch/olympia,beni55/olympia,shahbaz17/zamboni,harry-7/addons-server,psiinon/addons-server,crdoconnor/olympia,diox/olympia,magopian/olympia,anaran/olympia,Joergen/olympia,kmaglione/olympia,harikishen/addons-server,elysium001/zamboni,Nolski/olympia,mstriemer/zamboni,muffinresearch/olympia,mdaif/olympia,SuriyaaKudoIsc/olympia,ddurst/zamboni,muffinresearch/olympia,jamesthechamp/zamboni,muffinresearch/olympia,Joergen/zamboni,ayushagrawal288/zamboni,Hitechverma/zamboni,Witia1/olympia,clouserw/zamboni,ayushagrawal288/zamboni,spasovski/zamboni,Joergen/zamboni,washort/zamboni,yfdyh000/olympia,Prashant-Surya/addons-server,kumar303/olympia,jasonthomas/zamboni,ngokevin/zamboni,bqbn/addons-server,elysium001/zamboni,andymckay/addons-server,kmaglione/olympia,ingenioustechie/zamboni,tsl143/addons-server,jpetto/olympia,atiqueahmedziad/addons-server,luckylavish/zamboni,psiinon/addons-server,tsl143/zamboni,kumar303/zamboni,robhudson/zamboni,Revanth47/addons-server,wagnerand/addons-server,wagnerand/zamboni,mozilla/olympia,tsl143/zamboni,Nolski/olympia,kumar303/olympia,yfdyh000/olympia,wagnerand/zamboni,andymckay/olympia,lavish205/olympia,andymckay/addons-server,mstriemer/addons-server,yfdyh000/olympia,shahbaz17/zamboni,magopian/olympia,mozilla/olympia,mstriemer/addons-server,muffinresearch/addons-server,mudithkr/zamboni,kumar303/addons-server,ddurst/zamboni,mudithkr/zamboni,lavish205/olympia,psiinon/addons-server,diox/olympia,kmaglione/olympia,clouserw/zamboni,atiqueahmedziad/addons-server,wagnerand/addons-server,Hitechverma/zamboni,jasonthomas/zamboni,koehlermichael/olympia,wagnerand/zamboni,clouserw/zamboni,Revanth47/addons-server,jasonthomas/zamboni,crdoconnor/olympia,harikishen/addons-server,kumar303/olympia,spasovski/zamboni,aviarypl/mozilla-l10n-addons-server,clouserw/zamboni,mozilla/addons-server,yfdyh000/olympia,aviarypl/mozilla-l10n-addons-server,beni55/olympia,ngokevin/zamboni,Revanth47/addons-server,mstriemer/addons-server,SuriyaaKudoIsc/olympia,jamesthechamp/zamboni,andymckay/olympia,beni55/olympia,muffinresearch/addons-server,bqbn/addons-server,kumar303/zamboni,washort/zamboni,koehlermichael/olympia,spasovski/zamboni,luckylavish/zamboni,wagnerand/olympia,mozilla/zamboni,kumar303/zamboni,tsl143/zamboni,Witia1/olympia,harikishen/addons-server,mstriemer/olympia,Prashant-Surya/addons-server,crdoconnor/olympia,Jobava/zamboni,aviarypl/mozilla-l10n-addons-server,Witia1/olympia,kmaglione/olympia,mozilla/olympia,andymckay/zamboni,andymckay/olympia,bqbn/addons-server,washort/zamboni,mudithkr/zamboni,eviljeff/olympia,kumar303/addons-server,shahbaz17/zamboni,aviarypl/mozilla-l10n-addons-server,magopian/olympia,tsl143/addons-server,johancz/olympia,koehlermichael/olympia,eviljeff/zamboni,eviljeff/olympia,jpetto/olympia,mozilla/zamboni,beni55/olympia,harry-7/addons-server,SuriyaaKudoIsc/olympia,Joergen/zamboni,mozilla/olympia,harry-7/addons-server,kumar303/zamboni,ingenioustechie/zamboni,Jobava/zamboni,mrrrgn/olympia,SuriyaaKudoIsc/olympia,tsl143/addons-server,robhudson/zamboni,kumar303/addons-server,tsl143/addons-server,anaran/olympia,mstriemer/olympia,diox/olympia,andymckay/addons-server,mrrrgn/olympia,mdaif/olympia,Joergen/olympia,muffinresearch/addons-server,johancz/olympia,spasovski/zamboni,muffinresearch/olympia,jamesthechamp/zamboni,andymckay/olympia,ngokevin/zamboni,tsl143/zamboni,Joergen/zamboni,mdaif/olympia