Assigning a policy to a role with same the numeric id causes 'Integrity constraint violation'

E.g. trying to assign policy with policy id 2 to role with role id 2:

Ocurs when

• Creating the policy and try to assign the role(s) in this step
• trying to assign the role to a existing policy

The name row in table password_policy_role might consist of $pid.'-'.$rid and must not be empty?

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '2-' for key 'name': INSERT INTO {password_policy_role} (pid, rid) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1); Array ( [:db_insert_placeholder_0] => 2 [:db_insert_placeholder_1] => 2 ) in password_policy_admin_form_submit() (Zeile 444 von /xxx/drupal/stein-stein.de/drupal/sites/default/modules/password_policy/password_policy.admin.inc).

Attached patch fixes above the exception and let you assign roles to policies with the same numeric id´s.

THX to 'leon der profi' for prividing this patch!