* fix: empty url group bug
moving a row to empty url (no status) group would change the row's
url to the group id which is not empty, its a random string.
fixed it with puting a check to fill the url with the empty string
when the group id is equal to empty url group id
* fix: move empty group check to `insert_url_cell`
because evereywhere using `insert_url_cell` we want to check that.
* chore: cargo fmt
---------
Co-authored-by: nathan <nathan@appflowy.io>
59cb4a890a