Succeed when save modified is canceled on unique new record

The reload does not set any current record so we can not compare ids.

issue9936
review314991002

tryton/gui/window/form.py

@@ -557,7 +557,10 @@ class Form(SignalEvent, TabContent):
             if value == 'ko':
                 record_id = self.screen.current_record.id
                 if self.sig_reload(test_modified=False):
-                    return record_id == self.screen.current_record.id
+                    if self.screen.current_record:
+                        return record_id == self.screen.current_record.id
+                    elif record_id < 0:
+                        return True
             return False
         return True