patch 8.1.0740: Tcl test fails

Problem:    Tcl test fails.
Solution:   When the argument is empty don't give an error, instead rely on
            the error reporting higher up.

src/version.c

@@ -795,6 +795,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    740,
 /**/
     739,
 /**/