Steps to reproduce:
1.Create a new workflow that contains a handler that doesn't exist (e.g. a busted workflow)
2.Choose from the admin ui to upload media and process with that workflow
3.The ui will show upload succeeds, but doesn't show that everything else succeeds. So you're left looking at a web page form that you're not sure if it worked or not, or what the state might be.
Recommended fix: if it didn't success, go to a page with a red error bar indicating something is wrong (even if you can't gracefully handle what is wrong, as in this case)
Workaround (if any):