ValkyrieIngestJob: ensure FileMetadata exists
ValkyrieIngestJob: ensure FileMetadata exists

Some adapters (fcrepo) will automatically create a metadata object, while others
won't.  So let's do a little `find_or_create`-style check here to make sure we
don't try to query a non-existent object.

samvera/hyrax,samvera/hyrax,samvera/hyrax,samvera/hyrax