Try this, make a rule with no conditions.

Copy it, so you have two of them.

The XML for an empty condition block is something like:

<rule>
<description>Test</description>
<conditions>
<and/>
</conditions>
<actions>
<do-break/>
</actions>
</rule>

Then try this one:

<rule>
<description>Test</description>
<conditions/>
<actions>
<do-break/>
</actions>
</rule>

Take out the <and/> node, and look at how it displays differently.

Also, seems to trigger a strange Designer display bug, as the rules stop
folding, unfolding correctly.