Follow-up for missing RNA genes on chrMT

[holtgrewe]

Is your feature request related to a problem? Please describe.
CDOT has an issue with RNA genes on chrMT for ENSEMBL. We are using these transcripts for the coding chrMT genes already and it would be nice to fill the gap of missing transcripts from there.

Describe the solution you'd like
Follow up on the problem raised in SACGF/cdot#72 and ensure that the build works with Mehari once fixed.

Describe alternatives you've considered
N/A

Additional context

• Processing of mitochondrial genes RNA genes broken for ENSEMBL SACGF/cdot#72