CompositeAudioClip not compute duration

[CorrM]

The __init__ function should look something like that:

        if not any([(e is None) for e in ends]):
            self.duration = max(ends)
            self.end = max(ends)
        elif not any([(d is None) for d in [c.duration for c in self.clips]]):
            self.duration = max([c.duration for c in self.clips])
            self.end = self.duration

because the docs for clips are:

clips
      List of audio clips, which may start playing at different times or
      together. If all have their ``duration`` attribute set, the
      duration of the composite clip is computed automatically.

[OsaAjani]

Thank you for your contributions and for reporting issues in this repository. With the release of v2, which introduces significant changes to the codebase and API, we’ve reviewed the backlog of open PRs and issues. Due to the length of the backlog and the likelihood that many of these are either fixed or no longer applicable, we’ve made the decision to close all previous PRs and issues.

If you believe that any of these are still relevant to the current version or if you'd like to reopen a related discussion, please feel free to create a new issue or pull request, referencing the old one.

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