Parser Test Case containing an empty info set should warn/error.

The following example should cause the TDML Runner to fail/error for this test.

Example:

<tdml:parserTestCase name="abc" root="doc"
model="model" description="desc">

<tdml:document>
<tdml:documentPart type="text"><![CDATA[]]></tdml:documentPart>
</tdml:document>

<tdml:infoset>
<tdml:dfdlInfoset>
</tdml:dfdlInfoset>
</tdml:infoset>
</tdml:parserTestCase>