Gracefully handle failure to load package cache files.
Gracefully handle failure to load package cache files.

nazriel/dub,dreamsxin/dub,Geod24/dub,Flamaros/dub,jeanbaptistelab/dub,alexeibs/dub,xentec/dub,D-Programming-Language/dub,gedaiu/dub,rjframe/dub,Abscissa/dub-data-mod,grogancolin/dub,jelmansouri/dub,p0nce/dub,y12uc231/dub,Abscissa/dub,schuetzm/dub