neovim/neovim — pull request #738 by dougschneider (2014-05-20 03:54:28+00:00)
Title: vim-patch:7.4.275

Problem: When changing the type of a sign that hasn't been
placed ther is no error message.
Solution: Add an error message. (Christian Brabandt)

Author: Bram Moolenaar

https://code.google.com/p/vim/source/detail?r=8a3117a4887c1e12a1165c9719491f96753