scikit-hep / iminuit / 33674245755

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fix: make hide_modules exception-safe and cheapen is_module_available (#1167)

:robot: _AI text below_ :robot:

`hide_modules` removed its finder from `sys.meta_path` by identity, but
did not guard against the finder already being gone, so an exception
raised inside the `with` block (or code that rebuilt `sys.meta_path`)
could raise `ValueError` on exit instead of restoring `sys.meta_path`
and the hidden modules. `is_module_available` now checks for a module
spec instead of fully importing the module, which is cheaper and avoids
import side effects.

Split out of #1139. Addresses part of #1132.

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