JScript error handling in msxsl ?

Is there a way to handle JScript errors in msxsl?  When using JavaScript in
a browser, you can define an error handler for the window, but I can't find
an equivalent object for handing errors in MSXSL.

See the example below.  In Microsoft's MSXSL processor, the getAttribute()
function throws an error and aborts processing of the stylesheet if the
attribute is not present.  I have a document element with several optional
attributes, and I want to print those that are present.  I can't find any
way to make this work, short of creating a whole bunch of alternative rules
that check for all permutations of  attribute presence in the rule condtion.
e.g.

  <target-element type="Field">
    <attribute name="name" has-value="yes"/>

Any suggestions would be greatly appreciated!

<define-script><![CDATA[
  function testAttribute(e, name) {
    if(e.getAttribute(name) != null) return e.getAttribute(name);
    else return "";
  }
]]></define-script>


<rule>
  <target-element type="Field"/>

  <TR>
  <TD><eval>getAttribute("name")</eval></TD>
  <TD><eval>testAttribute(this, "type")</eval></TD>
  <TD><eval>testAttribute(this, "default")</eval></TD>
  <TD><eval>testAttribute(this, "enum")</eval></TD>
  </TR>
</rule>


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