view .clang-format @ 45899:f96059fa519c

extensions: gracefully warn when doing min version check with no local version

After doing a `make clean`, I started getting cryptic failures to import
extensions with the `minimumhgversion` attribute on py3:

    *** failed to import extension evolve: '>' not supported between instances of 'int' and 'NoneType'
    *** failed to import extension topic: '>' not supported between instances of 'int' and 'NoneType'

This now handles the `(None, None)` tuple before comparing, and disables the
extension with the same friendly message as in py2.

Differential Revision: https://phab.mercurial-scm.org/D9363

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