patch 7.4.1567

Problem:    Crash in assert_fails().
Solution:   Check for NULL. (Dominique Pelle)  Add a test.

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1567,
 /**/
     1566,
 /**/