That's weird. The form editor automatically displays two empty fields for adding new aspects. But it should not save them if they are left empty. And actually - making the aspect description empty is the way how the aspect is deleted (although there is an old requirement to improve this editing interface).
I assume you have the editor enabled in your profile. Please try to switch it to display the raw HTML code of the aspect description and remove all the contents there. Chances are that somehow, some "invisible" HTML contents gets there (that's why I personally prefer not using the editor, by the way).