Seems unnecessary as Geoff Simmons stated. It also uses " " named entity, which can create problems with XHTML (with the correct content-type header). Only few "named entities" are pre-defined in XML. One must use " " with XHTML docs or define nbsp manually in DTD (i.e. <!ENTITY nbsp " ">).
See <www.w3.org/TR/REC-xml/#sec-predefined...; for pre-defined named entities.
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I don't see what advantages this has over Template Toolkit's own conditional operators. For example, using a logical OR:
<td>[% variable || ' ' %]</td>
... would achieve the same effect (with more characters required).
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