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.
diff --git a/src/version.c b/src/version.c
index 8afe3e1..d868137 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    740,
+/**/
     739,
 /**/
     738,