code: def strand_unknown(db, transcript):
      
      features = list(db.children(transcript))
      strand = features[0].strand
      if strand == ".":
          return True
      else:
          return False
docs: for unstranded data with novel transcripts single exon genes
      will have no strand information. single exon novel genes are also
      a source of noise in the Cufflinks assembly so this removes them