Avoid exception in up-to-date check for non-existent source files and trigger rebuild instead.
Avoid exception in up-to-date check for non-existent source files and trigger rebuild instead.

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