When deleting a tag, you must select it and it will use that tag to filter, once deleted the active tag stays ON and can not be switched off by using the "X", user must logout/in to fix it.
To reproduce :
1: Create a few tags.
2: Select a tag edn delete it, delete all available tags.
3: Try to disable the last tag ( already deleted ) by clicking on the "X" button.
I guess there must be a check if the tag still exists or right after deletion check if the tag is active and remove it from active state as well.
