vocabs.loader: only cache roots for vocabs that are found.
vocabs.loader: only cache roots for vocabs that are found.

factor/factor,mrjbq7/factor,tgunr/factor,mrjbq7/factor,factor/factor,factor/factor,tgunr/factor,tgunr/factor,factor/factor,tgunr/factor,tgunr/factor,mrjbq7/factor,factor/factor,mrjbq7/factor,mrjbq7/factor,tgunr/factor,factor/factor,mrjbq7/factor