patch 8.1.0296: command parsing for 'incsearch' is a bit ugly

Problem:    Command parsing for 'incsearch' is a bit ugly.
Solution:   Return when there is no pattern.  Put common checks together.
diff --git a/src/version.c b/src/version.c
index a084de0..194ee4c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    296,
+/**/
     295,
 /**/
     294,