After Random characters in autosuggest field for categories, you'll get directly the XHR response

[forgive38]

Describe the bug
During th submission process, when you have more than 10 categories, a autosuggest field is used. And if you enter some random characters in and hit Enter, you'll get the result of XHR request.

To Reproduce

1. Go to testdrive 3.4
2. enable categories, add more than 10 categories
3. make a new submission and in For the Editors tab, try it
4. See error

What application are you using?
OJS 3.4 testdrive