lint - remove unused imports and fix ambiguous if

            for i, meta in enumerate(metadata):

                meta.extend(metadata_MASA[i])

        if not cfg.input["fmt"].startswith("ISM") and not "MASA" in cfg.input["fmt"]:

        if not (cfg.input["fmt"].startswith("ISM") or "MASA" in cfg.input["fmt"]):

            metadata = [None] * len(cfg.items_list)

        cfg.metadata_path = metadata

from shutil import copyfile

from typing import Optional, Union

from numpy import empty

from ivas_processing_scripts.audiotools import audio, audioarray, metadata

from ivas_processing_scripts.audiotools.audiofile import write

from ivas_processing_scripts.audiotools.convert.channelbased import convert_channelbased

            )

        # no metadata

        if not "ISM" in preproc_output_fmt and not "MASA" in preproc_output_fmt:

        if not ("ISM" in preproc_output_fmt or "MASA" in preproc_output_fmt):

            list_item.append(None)

        cfg.metadata_path.append(list_item)