How do I remove the Category Field from incident view if there are currently no existing categories?

Hi, I've identified the issue. If you have categories with subcategories, and you delete all of the parent categories then Service Desk will continue displaying an empty category dropdown.

I've raised this as a defect, so we should have a fix ready in a few weeks. If you cannot wait, I can fix the problem on your account, but in order for that to happen you would need to contact Citrix Global Support http://support.citrixonline.com/en_US/GoToAssistServiceDesk/contact?question=category