uuid_update_7103() fails

Problem

I get the following error when upgrading a Drupal 6 database which had a UUID 6.x-1.0-rc2 module enabled:

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the[error]
right syntax to use near 'AS , t.tid AS tid
FROM
taxonomy_term_data t
WHERE  ( IN  ('bcb92ce8-2236-e264-6' at line 1
Performed update: uuid_update_7103                                                                                                                                  [ok]

Diagnosis

Apparently a NULL value is supplied for $uuid_key in the db_select() of entity_get_id_by_uuid. This is because $info['entity keys']['uuid'] is not set.

Workaround

Add this to uuid.install right after entity_get_info() in uuid_update_7103():

if (!isset($info['entity keys']['uuid'])) continue;