This is a case of not seeing the forest for the trees: In the v3 changes, we did introduce MissingInputFile exception (for OCRD_MISSING_INPUT=ABORT). But that only applied narrowly: iff there is no mets:file in one of the input fileGrps.

However, the more important case seems to be that there is a mets:file (regardless of the number of input fileGrps), but it is not available locally, and OCRD_DOWNLOAD_INPUT=False was set deliberately – to either trigger OCRD_MISSING_INPUT=ABORT or OCRD_MISSING_INPUT=SKIP.

But we did not implement this case yet – instead, we let the function proceed without download, which will then fail (without the SKIP behaviour) at page_from_file.

So now the ABORT and SKIP behaviours are enforced for locally missing files, too.