If we are running a non-genome analysis, pull the regional file for analysis.

def _get_regional_bed_file(data):
    """If we are running a non-genome analysis, pull the regional file for analysis.
    """
    variant_regions = bedutils.merge_overlaps(tz.get_in(["config", "algorithm", "variant_regions"], data),
                                              data)
    is_genome = data["config"]["algorithm"].get("coverage_interval", "exome").lower() in ["genome"]
    if variant_regions and utils.file_exists(variant_regions) and not is_genome:
        return variant_regions