About new post category choosing

When you post a new post, the primy category is fixed, if you want to cancel it, you must first select the category, and then cancel the default category.

This is really very troublesome, if it can be set as you do not choose the category, you can't publish a post, it is just like that if it doesn't text the title, it can't be published .

I think it's very inconvenient. When you create a new post, you must make sure that you do have a primy category, and you have to be careful and don't choose the wrong category.

a bug: I want cancel the primy category, it show me a blank dialog.