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BUG: protect against accessing base attribute of a NULL subarray - #19353
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Have PyArray_GetCastSafety return -1 if from is NULL
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Backport of #19326.
closes #19325
This PR is to protect against potential segfaults in void_to_void_resolve_descriptors. This is the first time I have looked at this code, so there may be a better solution, but this seems to work for the example given in #19325