Set return type of make_src_region_file to None
Set return type of make_src_region_file to None

Co-authored-by: J. Alvarez-Jarreta <209e52299550b20e7d87468c394c79315b3e697d@ebi.ac.uk>
Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara