fix up error handling for TarballFetcher
fix up error handling for TarballFetcher

troydemonbreun/yarn,lawliet89/yarn,ConAntonakos/yarn,seripap/emojiless-yarn,mgcrea/yarn,kasperlewau/yarn,CHECK24/yarn,troydemonbreun/yarn,FLGMwt/yarn,FLGMwt/yarn,mgcrea/yarn,suitupalex/yarn,mourner/yarn,mvestergaard/yarn,CHECK24/yarn,kasperlewau/yarn,joeyespo/yarn,bsansouci/esy,ConAntonakos/yarn,bsansouci/esy,dxu/yarn,seripap/emojiless-yarn,andreypopp/esy,suitupalex/yarn,MiguelAlho/yarn,onemen/yarn,dguo/yarn,andreypopp/esy,MiguelAlho/yarn,onemen/yarn,bsansouci/esy,dguo/yarn,andreypopp/esy,lawliet89/yarn,mourner/yarn,joeyespo/yarn,mvestergaard/yarn,dxu/yarn