Fix handling of invalid iterator in zend_weakmap_iterator_get_current_get() #16436
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Fixes GH-16371
WeakMap's implementation of
zend_object_iterator_funcs.get_current_keydoesn't handle invalid states.Here I set the
keytoNULLinzend_weakmap_iterator_get_current_get()when there is no more elements. This matches other implementations ofzend_object_iterator_funcs.get_current_keyas well as the documentation ofIterator::key.