The output from the ASK query is not valid XML. The "results" tag has the / at the start rather than the end.
For example, if I call ts-query like this:
ts-query -d bioguid -m -f sparql -l sparql "ASK WHERE { <http://bioguid.info/gi:63099141> ?s ?p. } "
I get this response:
Content-Type: text/xml
<?xml version="1.0"?>
<sparql xmlns="http://www.w3.org/2005/sparql-results#">
<head>
</head>
<boolean>false</boolean>
</results>
</sparql>
Notice the "</results>" tag should be "<results/>".