taxonomy_save_vocabulary() should check for 'tags' not set

I've found a problem when using postgresql: when going to admin/forum for the first time the module adds a taxonomy term or category "Forum", using taxonomy_save_vocabulary() function [it's done in _forum_get_vid()].
But it does not set "tags" in the array and then in taxonomy_save_vocabulary() you get error in sql:

pg_query(): Query failed: ERROR: invalid input syntax for integer: ""
query: INSERT INTO vocabulary (name, description, help, multiple, required, hierarchy, relations, tags, weight, module, vid) VALUES ('Forums', '', '', 0, 1, 1, 0, '', 0, 'forum', '1')

I've fixed this by changing taxonomy_save_vocabulary so it check if "tags" is set and if not it sets it to default. This function already does similar checks for "nodes" and "weight".