Hi Tony,
The reason why you're getting null results is because there's a Javascript execute error:
<javascript><![CDATA[Error: double default label in the switch statement<javascript>:180: default:^]]></javascript>
<javascript><![CDATA[Error: invalid return<javascript>:191:return ^true;]]></javascript>
<javascript><![CDATA[Error: syntax error<javascript>:192: }^]]></javascript>
<javascript><![CDATA[Exception: Compilation produced 3 syntax errors. (<javascript>#1)]]></javascript>
Unfortunately, there's not much I can do to help you with this issue because these tables are not official YQL tables.