Prevent exception in on_change_party of move if party has not receivable nor

payable account for issue891

move.py

@@ -812,6 +812,10 @@ class Line(ModelSQL, ModelView):
         party = party_obj.browse(cursor, user, vals.get('party'),
                 context=context)
 
+        if not party.account_receivable \
+                or not party.account_payable:
+            return res
+
         if party and (not vals.get('debit')) and (not vals.get('credit')):
             query = 'SELECT ' \
                         'COALESCE(SUM(' \