docs: def is_bam_valid(bam_file):
      """Check if bam file is valid. Raises a ValueError if pysam cannot read the file.
  
      #TODO: pysam  does not differentiate between BAM and SAM
      """
      try:
          f = pysam.AlignmentFile(bam_file)
      except ValueError:
          raise
      except:
          raise
      else:
          f.close()
  
      return True