patch 8.2.3459: Vim9: need more tests for empty string arguments Commit: https://github.com/vim/vim/commit/51491adfa86fd66a857cd7ec50d0b57dbdf3da59 Author: Yegappan Lakshmanan <yegappan@yahoo.com> Date: Thu Sep 30 19:00:00 2021 +0100 patch 8.2.3459: Vim9: need more tests for empty string arguments Problem: Vim9: need more tests for empty string arguments. Solution: Add more tests. Also use empty argument with menu_info() to get the top-level menu names. (Yegappan Lakshmanan, closes #8925)