[Zope] Subject: problem with "required" parameter

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If I use a dtml method called "first" with this code:
  <form action="second" method="POST">
  <input name="animal:required">
  </form>
 Too many errors encountered; the rest of the message
is ignored:
 
 Now, I don't know How do  I to catch the error in the
 dtml called "second"
   <dtml-try>
     the name of animal is:<dtml-var animal>
   <dtml-except EMPTY> 
     ERROR you write a empty string
   </dtml-try>


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