[alicebot-style] what happens to pattern or pattern side that

[Gary Dubuque]

Given:

<category>
<pattern/>
<that/>
<template/>
</category>

What happens when pattern is null?  It cannot match - right?  Is it allowed?

What happens what pattern side that is null (found a few categories in an
old AAA set like this)?  Does it turn into * or is it illegal?

Is a null template allowed?

I'm not aware of these being clear in the specs.