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When `pytz` is _not_ installed, importing `babel.localtime` could fail
(repeatedly) when the `TZ` environment variable is malformed enough to be
caught by `_validate_tzfile_path`, which might throw a certain `ValueError`.

(When `pytz` is installed, it would raise an `UnknownTimeZoneError` we
already catch and ignore for the same sort of input.)

Fixes #1092