patch 9.0.1806: Vim9: bogus error on export

Problem:  Vim9: bogus error on export
Solution: Don't error out when the export command is not executed

closes: #12912
closes: #12930

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: LemonBoy <thatlemon@gmail.com>
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 8fda332..32d52ab 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2586,8 +2586,8 @@
 
 #ifdef FEAT_EVAL
     // A command will reset "is_export" when exporting an item.  If it is still
-    // set something went wrong.
-    if (is_export)
+    // set something went wrong or the command was never executed.
+    if (!ea.skip && is_export)
     {
 	if (errormsg == NULL)
 	    errormsg = _(e_export_with_invalid_argument);