User percent encoded name of inexistant database

Closes #14801
(grafted from 5fddfb00cfffa81177c0b5ddda6aaecaccfe19da)

--HG--
branch : 8.0

trytond/trytond/backend/sqlite/database.py

@@ -547,7 +547,8 @@ class Database(DatabaseInterface):
             db_path = safe_join(
                 config.get('database', 'path'), self.name + '.sqlite')
             if not os.path.isfile(db_path):
-                raise IOError("Database '%s' doesn't exist!" % db_path)
+                raise DatabaseOperationalError(
+                    f"Database '{db_path}' doesn't exist!")
             db_uri = base_uri._replace(path=db_path)
 
         # Use unparse before replacing sqlite with file because SQLite accepts

trytond/trytond/tests/test_transaction.py

@@ -33,8 +33,8 @@ class TransactionTestCase(TestCase):
         and ensure that it stops cleanly and allows starting of next
         transaction'''
         self.assertRaises(
-            Exception, empty_transaction, "Non existant DB", USER,
-            context=CONTEXT)
+            backend.DatabaseOperationalError, empty_transaction,
+            "Non%20existant%20DB", USER, context=CONTEXT)
         self.assertTrue(empty_transaction(DB_NAME, USER, context=CONTEXT))
 
     def test_set_user(self):