[fix] exception type has changed

--HG--
branch : 3.26

cubicweb/test/unittest_rset.py

@@ -571,8 +571,8 @@ class ResultSetTC(CubicWebTC):
         with self.admin_access.web_request() as req:
             rset = req.execute('Any D, COUNT(U) GROUPBY D WHERE U is CWUser, U creation_date D')
             rset.possible_actions(argument='Value')
-            self.assertRaises(AssertionError, rset.possible_actions, argument='OtherValue')
-            self.assertRaises(AssertionError, rset.possible_actions, other_argument='Value')
+            self.assertRaises(ValueError, rset.possible_actions, argument='OtherValue')
+            self.assertRaises(ValueError, rset.possible_actions, other_argument='Value')
 
     def test_count_users_by_date(self):
         with self.admin_access.web_request() as req: