Return the journal for a bank account if only one journal matches

Closes #14422
(grafted from 3c64a52035111a978e237d0bb358247a4ac0bab2)

--HG--
branch : 7.0

modules/account_statement/journal.py

@@ -85,6 +85,6 @@ class Journal(DeactivableMixin, ModelSQL, ModelView):
                     ('bank_account.numbers.number_compact', '=', number),
                     ],
                 ])
-        if journals:
+        if len(journals) == 1:
             journal, = journals
             return journal