vim-patch:7.4.337

Problem:    When there is an error preparing to edit the command line, the
            command won't be executed. (Hirohito Higashi)
Solution:   Reset did_emsg before editing.

https://code.google.com/p/vim/source/detail?r=v7-4-337

src/nvim/version.c

@@ -258,7 +258,7 @@ static int included_patches[] = {
   //340 NA
   339,
   338,
-  //337,
+  337,
   //336,
   335,
   334,