[Zope] dtml-var null

[Dennis Moore]

Does the 'null' tag in <dtml-var null="..."> actually work for anyone?  I
set it to put '&nbsp;' (among other things) in for a database query i'm
working on, but it doesn't do anything.  I get no output for that var no
matter what's in the null tag.  the documentation says:

 For this reason, the null attribute can be used to specify text to
be inserted for null values. Null values are defined as values which:

o Cannot be formatted with the specified format, and 
o Are either the special Python value None or are false and yield an 
  empty string when converted to a string. 

The value itself yields an empty string as far as I can tell.

Thanks

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