Upgrade error if relationship type already exists

The upgrade from 4.2.7 to 4.3 alpha2 fails if the relationship type "Partner of" already exists.

To fix the issue, I edited the file "CRM/Upgrade/Incremental/sql/4.3.alpha2.mysql.tpl"

The failing line:
INSERT INTO `civicrm_relationship_type` ( name_a_b,label_a_b, name_b_a,label_b_a, description, contact_type_a, contact_type_b, is_reserved )
VALUES
( 'Partner of', '

{ts escape="sql"}Partner of{/ts}', 'Partner of', '{ts escape="sql"}

Partner of

{/ts}', '{ts escape="sql"}Partner relationship.{/ts}

', 'Individual', 'Individual', 0 );

was changed to:
INSERT IGNORE INTO `civicrm_relationship_type` ( name_a_b,label_a_b, name_b_a,label_b_a, description, contact_type_a, contact_type_b, is_reserved )
VALUES
( 'Partner of', '

{ts escape="sql"}Partner of{/ts}', 'Partner of', '{ts escape="sql"}

Partner of

{/ts}', '{ts escape="sql"}Partner relationship.{/ts}

', 'Individual', 'Individual', 0 );