patch 9.0.1531: crash when register contents ends up being invalid Commit: https://github.com/vim/vim/commit/d1ae8366aff286d41e7f5bc513cc0a1af5130aad Author: Bram Moolenaar <Bram@vim.org> Date: Tue May 9 17:09:30 2023 +0100 patch 9.0.1531: crash when register contents ends up being invalid Problem: Crash when register contents ends up being invalid. Solution: Check "y_array" is not NULL.

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