patch 8.2.2340: win_execute() unexpectedly returns number zero when failing Commit: https://github.com/vim/vim/commit/37487e16da7877129edee8d11b9b7f5c8df312c6 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jan 12 22:08:53 2021 +0100 patch 8.2.2340: win_execute() unexpectedly returns number zero when failing Problem: win_execute() unexpectedly returns number zero when failing. Solution: Return an empty string. (closes https://github.com/vim/vim/issues/7665)