title: Jenkins - Uno Choice Plugin - can't get reference value
body: <p>I'm trying to use Uno-Choice Cascade Dynamic Choice Parameter plugin in Jenkins
  <a href="https://wiki.jenkins-ci.org/display/JENKINS/Uno+Choice+Plugin" rel="nofollow">https://wiki.jenkins-ci.org/display/JENKINS/Uno+Choice+Plugin</a></p>
  
  <p>The problem is that I can't access the value of the Referenced parameter.
  I use the Groovy script that in the example but I can't get the value of States moreover it even 
  doesn't return the ["Unknown state"] in the script as it return the one from the Fallback script</p>
  
  <pre><code>if (States.equals("Sao Paulo")) {
    return ["Barretos", "Sao Paulo", "Itu"]
  } else {
    return ["Unknown state"]
  }
  </code></pre>
  
  <p>I have Jenkins V1.593, Uno-Choice Plug-in V0.21</p>