Fix unhandled exception in set_caster #772
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`obj_iter` throws `python_error` on failure, but type casters aren't allowed to throw! If you try to from-Python cast an object of a non-iterable type, Python will abort from the unhandled exception coming from a `noexcept` function It looks like the intention here is to handle failure manually (a NULL return from the CPython call), so I did just that
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obj_iterthrowspython_erroron failure, but type casters aren't allowed to throw! If you try to from-Python cast an object of a non-iterable type, Python will abort from the unhandled exception coming from anoexceptfunctionIt looks like the intention here is to handle failure manually (a NULL return from the CPython call), so I did just that