patch 7.4.1507

Problem:    Crash when starting a job fails.
Solution:   Check for the channel to be NULL.  (idea by Yasuhiro Matsumoto)

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1507,
 /**/
     1506,
 /**/