chore(sign): handle NewUnit errors in signing tests
chore(sign): handle NewUnit errors in signing tests

endocode/fleet,improbable-io/fleet,webwlsong/fleet,octoblu/fleet,mwhooker/fleet,coreos/fleet,improbable-io/fleet,dalbani/fleet,coreos/fleet,esatterwhite/fleet,jonboulle/fleet,thepwagner/fleet,dongsupark/fleet,coreos/fleet,paveltiunov/fleet,hhoover/fleet,giantswarm/fleet,ecnahc515/fleet,ecnahc515/fleet,mwitkow/fleet,wuqixuan/fleet,thepwagner/fleet,bcwaldon/fleet,mwhooker/fleet,bviswana101/fleet,jonboulle/fleet,flandr/fleet,mischief/fleet,mischief/fleet,octoblu/fleet,mwitkow-io/fleet,dongsupark/fleet,bviswana101/fleet,flandr/fleet,giantswarm/fleet,endocode/fleet,improbable-io/fleet,hhoover/fleet,WPMedia/fleet,webwlsong/fleet,giantswarm/fleet,mwitkow-io/fleet,mookjp/fleet,jonboulle/fleet,esatterwhite/fleet,dalbani/fleet,mookjp/fleet,mwitkow/fleet,bcwaldon/fleet,bcwaldon/fleet,WPMedia/fleet,dongsupark/fleet,dalbani/fleet,wuqixuan/fleet,paveltiunov/fleet,ecnahc515/fleet,endocode/fleet