r can't replace n and N on Vim 7.3.704

gistfile1.diff

diff -r 06e088d016ad src/normal.c
--- a/src/normal.c      Sun Oct 21 23:56:05 2012 +0200
+++ b/src/normal.c      Mon Oct 22 11:26:36 2012 +0900
@@ -1086,7 +1086,7 @@
                ca.nchar = ca.extra_char;
                idx = find_command(ca.cmdchar);
            }
-           else if (ca.nchar == 'n' || ca.nchar == 'N')
+           else if ((ca.nchar == 'n' || ca.nchar == 'N') && !stuff_empty())
                ca.oap->op_type = get_op_type(*cp, NUL);
            else if (*cp == Ctrl_BSL)
            {