don't exit when "git rev-parse" fails
don't exit when "git rev-parse" fails

so that the version number is always echoed on stdout.

github/hub,nlutsenko/hub,nlutsenko/hub,naru0504/hub,jingweno/hub,tomasv/hub,isundaylee/hub,adjohnson916/hub,nmfzone/hub,rlugojr/hub,jpkrohling/hub,nmfzone/hub,aereal/hub,dongjoon-hyun/hub,sbp/hub,pcorpet/hub,terry2000/hub,terry2000/hub,SanCoder-Q/hub,ASidlinskiy/hub,sbp/hub,elancom/hub,aereal/hub,codydaig/hub,pankona/hub,pwaller/hub,hopil/hub,ryo33/hub,SanCoder-Q/hub,ASidlinskiy/hub,adjohnson916/hub,boris-rea/hub,hb9kns/hub,isundaylee/hub,github/hub,codydaig/hub,github/hub,terry2000/hub,boris-rea/hub,jpkrohling/hub,hb9kns/hub,hopil/hub,cpick/hub,aspiers/hub,elancom/hub,naru0504/hub,RichardLitt/hub,naru0504/hub,pwaller/hub,aereal/hub,jingweno/hub,rlugojr/hub,pcorpet/hub,tomasv/hub,codydaig/hub,pwaller/hub,dongjoon-hyun/hub,AndBicScadMedia/hub,elancom/hub,xantage/hub,haikyuu/hub,haikyuu/hub,xantage/hub,cpick/hub,whilp/hub,RichardLitt/hub,ryo33/hub,rlugojr/hub,cpick/hub,ryo33/hub,hopil/hub,isundaylee/hub,dongjoon-hyun/hub,adjohnson916/hub,AndBicScadMedia/hub,pankona/hub,jpkrohling/hub,pcorpet/hub,pankona/hub,nlutsenko/hub,boris-rea/hub,github/hub,haikyuu/hub,nmfzone/hub,RichardLitt/hub,xantage/hub,tomasv/hub,aspiers/hub,sbp/hub,hb9kns/hub,jingweno/hub,whilp/hub,AndBicScadMedia/hub,whilp/hub,aspiers/hub,SanCoder-Q/hub,ASidlinskiy/hub