Use our_check_output in the ODT comparator.

    @staticmethod

    def odt2txt_variant():

        try:

            out = subprocess.check_output(["odt2txt", "--version"])

            out = our_check_output(["odt2txt", "--version"])

        except subprocess.CalledProcessError as e:

            out = e.output

        return out.decode("UTF-8").splitlines()[0].split()[0].strip()