docs: def _assembled_out_file_name(self):
          """Checks file name is set for assembled output.
             Returns absolute path."""
          if self.Parameters['-s'].isOn():
              assembled_reads = self._absolute(str(self.Parameters['-s'].Value))
          else:
              raise ValueError(
                  "No assembled-reads (flag -s) output path specified")
          return assembled_reads