vim-patch:7.4.1707

Problem:    Cannot use empty dictionary key, even though it can be useful.
Solution:   Allow using an empty dictionary key.

0921ecff1c

src/nvim/version.c

@@ -737,7 +737,7 @@ static int included_patches[] = {
   // 1710,
   // 1709 NA
   // 1708,
-  // 1707,
+  1707,
   // 1706 NA
   // 1705 NA
   1704,