patch 8.0.1478: unnecessary condition

Problem:    Unnecessary condition for "len" being zero.
Solution:   Remove the condition. (Dominique Pelle)
diff --git a/src/version.c b/src/version.c
index ce9b89c..6f0f78f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1478,
+/**/
     1477,
 /**/
     1476,