patch 8.2.2751: Coverity warns for using NULL pointer

Problem:    Coverity warns for using NULL pointer.
Solution:   Check for NULL in calling function.
diff --git a/src/version.c b/src/version.c
index ed22375..2e0d313 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2751,
+/**/
     2750,
 /**/
     2749,