Do you want to remove all rows where there is no account area, or, as in your example, the first one will appear?
If you want to remove all of them, then use the Select Expert and include something like this in the selection formula:
not IsNull({MyTable.AccountArea}) <--Use your actual table and field name here.
This will keep any records that don't have an account area from even being pulled from the database, so you won't have to do anything special with them in the report.
-Dell