Perform dependency resolution for missing default optional dependencies.
Perform dependency resolution for missing default optional dependencies.

If no dub.selections.json file exists, trigger dependency resolution if a default optional dependency is missing.

jeanbaptistelab/dub,grogancolin/dub,gedaiu/dub,Flamaros/dub,p0nce/dub,jelmansouri/dub,D-Programming-Language/dub,rjframe/dub,Geod24/dub