patch 8.1.2416: loading menus sets v:errmsg

Problem:    Loading menus sets v:errmsg.
Solution:   Avoid setting v:errmsg and add a test for that. (Jason Franklin)
diff --git a/src/version.c b/src/version.c
index 645631e..1831286 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2416,
+/**/
     2415,
 /**/
     2414,