algo: Raise error if only one of output-file and output-type is specified.

Refs #3026

added BugFix Online labels

assigned to @fweig

requested review from @fweig

enabled an automatic merge when the pipeline for 33bbde0d succeeds

Dear @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged