Write SQL query to solve given problem: Among the businesses without attribute, how many businesses located in Gilbert?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T2.business_id) FROM Business_Attributes AS T1 INNER JOIN Business AS T2 ON T1.business_id = T2.business_id WHERE T2.city = 'Gilbert' AND T1.attribute_value IN ('None', 'no', 'false')