[ews] Improve summary for CheckPatchRelevance build step.
Currently, if the patch doesn't have any relevant changes, the message is: 'Checked patch relevance (failure)', which is incorrect since there was no failure. It should be "Patch doesn't contain relevant changes".
Created attachment 395729 [details]
Committed r259694: <https://trac.webkit.org/changeset/259694>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 395729 [details].
Landed follow-up fix in r259719 since the failure message for CheckPatchRelevance needs to match with status-bubble code https://trac.webkit.org/browser/webkit/trunk/Tools/BuildSlaveSupport/ews-app/ews/views/statusbubble.py#L277