Handling missing node values with NodeModel

Hi.

I'm using a NodeModel and was wondering how missing nodes can be 
handled?  I'm looking for the equivalent of the unsafe_expr!default_expr 
notation 
(http://freemarker.sourceforge.net/docs/dgui_template_exp.html#dgui_template_exp_missing), 
but something that works for NodeModels (the default did not work for me).

BTW.. the template's in question use the .vars syntax in the 
expressions.  So, when I do the following I get an exception - 
${.vars["com.acme.Travel"]["checkIn"]!""}.  The exception is...

         Expecting a string, date or number here, Expression .vars["com.acme.Travel"]["checkIn"]!"" is instead a freemarker.ext.dom.NodeListModel
         The problematic instruction:
         ----------
         ==>  ${.vars["com.acme.Travel"]["checkIn"]!""} [on line 3, column 19 in free-marker-template]
         ----------

         Java backtrace for programmers:
         ----------
         freemarker.core.NonStringException: Error on line 3, column 21 in free-marker-template


Thanks in advance.

T.

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