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* Fix NULL pointer access when H5A_operator2_t is NULL Passing NULL for the callback function pointer to H5Aiterate2 and H5Aiterate_by_name was not detected, leading to a subsequent access of an uninitialized pointer. Add a check for this "no operator specified" case in both functions so they fail gracefully instead. Fixes GHSA-r7g4-hv2f-5c66 - CVE-2025-9274 * Fix format * Fix Java test to handle NULL callback to H5Aiterate2