The sentence shown when nothing in the source is mappable.
It names what the file does hold. A bare "nothing to export" leaves the
operator to guess whether the file is empty, unsupported, or broken — and
for the alignment-only files §9.4 is about, the answer is none of those.
The sentence shown when nothing in the source is mappable.
It names what the file does hold. A bare "nothing to export" leaves the operator to guess whether the file is empty, unsupported, or broken — and for the alignment-only files §9.4 is about, the answer is none of those.