Write SQL query to solve given problem: How many minority leaders have not been registered in Federal Election Commission data?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(*) FROM current AS T1 INNER JOIN `current-terms` AS T2 ON T1.bioguide_id = T2.bioguide WHERE T2.title = 'Minority Leader' AND (T1.fec_id IS NULL OR T1.fec_id = '')