MTIfNonZero: Undocumented Movable Type template tag

Movable Type 3.0 introduced the MTIfNonZero template tag. If you would like to take action in your template only if a tag has a non-zero entry, use MTIfNonZero for valid XHTML. Example:

<MTIfNonZero tag="MTEntryCommentCount">
<ol>
<MTComments>
<li><MTCommentAuthorIdentity> wrote something.</li>
</MTComments>
</ol>
</MTIfNonZero>

MTIfNonZero tag is currently not listed in the Movable Type template tag documentation but should be and it works.