Clicking 'submit for EWS analysis' button for patches on closed bug should display error, and such patches shouldn't be sent to EWS (buildbot). This is because the first thing our Buildbot builders do is to validate-patch, which will skip the patch if the corresponding bug is closed. Therefore sending the patch to Buildbot is useless, and might be confusing for users. It's better to display an error that the patch is not being sent to EWS since the corresponding bug is already closed.
Created attachment 404384 [details] Patch
Tested in https://ews.webkit-uat.org/status-bubble/404379 (feel free to click the button to check the new behavior)
Committed r264421: <https://trac.webkit.org/changeset/264421> All reviewed patches have been landed. Closing bug and clearing flags on attachment 404384 [details].
<rdar://problem/65626564>
> Committed r264421: <https://trac.webkit.org/changeset/264421> Deployed it on the server.