[issue29076] Mac installer shell updater script silently fails if default shell is fish

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

@Erland: The attached patch looks fine to me. Could you convert it to a PR?

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versions: +Python 3.10, Python 3.8, Python 3.9 -Python 2.7, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29076>
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