list, store data, if element states that its data is null, then set the value to null, rather than unsetting the key from the record. Needed for update of inline edit plugin to "please select" option
changed: db join element rendered as readonly was passing in an array to renderListData() which expected a string - and it was then doing all sorts of contorsions with values/labels in renderListData() - not sure its needed so commeted out
fixed potential notices in time element