6.0 beta 7

PDb_List class
fixed minor issue with search from classnames

PDb_List_Query class
avoided unset index in where_clauses prop

PDb_Session class
removed call to test_cookie() because it has proved unreliable

xnau_FormElement class
fallback value for multi-select elements needed the brackets removed so it wouldn't add a blank value to the array

git-svn-id: https://plugins.svn.wordpress.org/participants-database/trunk@969093 b8457f37-d9ea-0310-8a92-e5e31aec5664