patch 8.1.2325: crash when using balloon with empty line

Problem:    Crash when using balloon with empty line.
Solution:   Handle empty lines. (Markus Braun)
diff --git a/src/version.c b/src/version.c
index 0d8d597..c448e57 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2325,
+/**/
     2324,
 /**/
     2323,