RSS Feed/News template: if does not work if $var does not exist?

[ENXF NET]

Code:

<xf:if is="{{$forum.node_id}}">
      do something
    <xf:else />
      do something
    </xf:if>

This works as long I have $forum;
but it does not work, when there is no forum.

How can I do an isset() in a template?

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