patch 8.1.1707: Coverity warns for possibly using a NULL pointer

Problem:    Coverity warns for possibly using a NULL pointer.
Solution:   Change the logic to make sure no NULL pointer is used.
diff --git a/src/version.c b/src/version.c
index 573f741..b1187db 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1707,
+/**/
     1706,
 /**/
     1705,