code: def _get_project_vcf(x, suffix=""):
      
      vcfs = _get_variant_file(x, ("population", "vcf"), suffix=suffix)
      if not vcfs:
          vcfs = _get_variant_file(x, ("vrn_file_batch", ), suffix=suffix, ignore_do_upload=True)
          if not vcfs and x.get("variantcaller") == "ensemble":
              vcfs = _get_variant_file(x, ("vrn_file", ), suffix=suffix)
      return vcfs
docs: Get our project VCF, either from the population or the variant batch file.