commit https://github.com/vim/vim/commit/c4dcd60c76666bf113719f929709ad6120eb6528 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 26 22:56:46 2016 +0100 patch 7.4.1662 Problem: No test for an invalid Ex command on a channel. Solution: Test handling an invalid command gracefully. Avoid getting an error message, do write it to the channel log.