minor fix searcher contract

employee.py

@@ -13,7 +13,7 @@ class Employee(metaclass=PoolMeta):
         help='Salary monthly of person',
         depends=['contract'], readonly=True), 'get_salary')
     contract = fields.Function(fields.Many2One('staff.contract',
-        'Contract'), 'get_contract')
+        'Contract'), 'get_contract', searcher='search_contract')
     position = fields.Function(fields.Many2One('staff.position', 'Position'), 'get_position')
     curses = fields.Text('Curses')
     career = fields.Text('Career')
@@ -68,6 +68,10 @@ class Employee(metaclass=PoolMeta):
         if contracts:
             return contracts[0].id
 
+    @classmethod
+    def search_contract(cls, name, clause):
+        return
+
     def get_salary(self, name=None):
         if self.contract:
             return self.contract.salary