patch 8.1.1025: checking NULL pointer after addition

Problem:    Checking NULL pointer after addition. (Coverity)
Solution:   First check for NULL, then add the column.

src/version.c

@@ -779,6 +779,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1025,
 /**/
     1024,
 /**/