patch 9.0.1375: crash when getting member of obj of unknown class

Problem:    Crash when getting member of obj of unknown class.
Solution:   Check for NULL class and give an error message. (Ernie Rael,
            closes #12096)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1375,
 /**/
     1374,
 /**/