patch 8.2.3693: Coverity warns for possibly using a NULL pointer

Problem:    Coverity warns for possibly using a NULL pointer.
Solution:   Check for NULL and give an error.
diff --git a/src/version.c b/src/version.c
index 90021be..b7fe97b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3693,
+/**/
     3692,
 /**/
     3691,