title: Explicitly return empty Peewee recordset
body: <p>I'm running a query which accepts a search parameter. If the search parameter is ever empty I'd like to explicitly return an empty record set. There are a number of other cases in which it would be useful to return an empty recordset as well. I've sifted through the docs and the only option I see is <code>SelectQuery</code>, like so:</p>
  
  <pre><code>users = SelectQuery(User).where(User.id==0)
  </code></pre>
  
  <p>To be clear, I want an empty queryset, but it would be nice if I didn't have to fake a where clause to get it. I'm sure something like this exists, but I'm just not seeing it. Is there a better way?</p>