Ignore empty lines in --files-from
Ignore empty lines in --files-from

Closes #822

jayme-github/restic,fawick/restic,ar-jan/restic,stuertz/restic,kurin/restic,middelink/restic,byo/restic,restic/restic,kurin/restic,jayme-github/restic,fawick/restic,byo/restic,stuertz/restic,ar-jan/restic,restic/restic,middelink/restic