commit https://github.com/vim/vim/commit/385111bd86e0b38667879c3e89506ca1ae98e1df Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 12 19:23:00 2016 +0100 patch 7.4.1547 Problem: Getting a cterm highlight attribute that is not set results in the string "-1". Solution: Return an empty string. (Taro Muraoka)

--- a/src/version.c
+++ b/src/version.c
@@ -744,6 +744,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1547,
+/**/
     1546,
 /**/
     1545,