patch 7.4.1665

Problem:    Crash when calling job_start() with a NULL string. (Dominique)
Solution:   Check for an invalid argument.

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1665,
 /**/
     1664,
 /**/