patch 9.0.0837: append() reports failure when not appending anything Commit: https://github.com/vim/vim/commit/cd9c8d400c1eb9cbb4ff6a33be02f91a30ab13b2 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Nov 5 23:46:43 2022 +0000 patch 9.0.0837: append() reports failure when not appending anything Problem: append() reports failure when not appending anything. Solution: Only report failure when appending something. (closes https://github.com/vim/vim/issues/11498)