I tried to remove the general category.
1. I changed the settings to use some other category as the default.
2. I deleted the general category.
All of my categories no longer appeared listed in the admin area.
I restored my database from the backup. The categories reappeared.
I followed the same steps to try again. Same result...categories no longer listed in admin area. Had to restore again from backup.
Is there some other way to remove general without that happening?