patch 8.1.0568: error message for NUL byte in ScreenLines breaks Travis CI commit https://github.com/vim/vim/commit/9a8534673acd98d7398c967fe4348df63e689dab Author: Bram Moolenaar <Bram@vim.org> Date: Fri Dec 7 14:10:37 2018 +0100 patch 8.1.0568: error message for NUL byte in ScreenLines breaks Travis CI Problem: Error message for NUL byte in ScreenLines breaks Travis CI. Solution: Use a normal message fornow.

" Vim filetype plugin
" Language:	Dockerfile
" Maintainer:   Honza Pokorny <http://honza.ca>
" Last Change:	2014 Aug 29

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif

" Don't load another plugin for this buffer
let b:did_ftplugin = 1

let b:undo_ftplugin = "setl commentstring<"

setlocal commentstring=#\ %s