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

src/nvim/version.c

@@ -212,7 +212,7 @@ static int included_patches[] = {
   //278,
   277,
   //276,
-  //275,
+  275,
   274,
   //273,
   272,