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/testdir/test_vim9_import.vim b/src/testdir/test_vim9_import.vim
index 7d3691a..d470a34 100644
--- a/src/testdir/test_vim9_import.vim
+++ b/src/testdir/test_vim9_import.vim
@@ -2919,5 +2919,15 @@
   endif
 enddef
 
+def Test_export_in_conditional_block()
+  var lines =<< trim END
+      vim9script
+      if exists('this_will_fail')
+        export var MyVar = "hello"
+      endif
+  END
+  v9.CheckScriptSuccess(lines)
+enddef
+
 
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker