algo: Fix metrics when monitor is not present.

Small bug fix. Merging immediately. Doesn't affect anything outside of cbmreco-binary.

enabled an automatic merge when the pipeline for 2094b006 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