vim-patch:7.4.749

Problem:    For some options two consecutive commas are OK. (Nikolay Pavlov)
Solution:   Add the P_ONECOMMA flag.

0e7c4b99c6

scripts/genoptions.lua

@@ -39,6 +39,7 @@ local redraw_flags={
 
 local list_flags={
   comma='P_COMMA',
+  onecomma='P_ONECOMMA',
   flags='P_FLAGLIST',
   flagscomma='P_COMMA|P_FLAGLIST',
 }