title: Zend Form Empty Option Element in Select Tag
body: <p>In a web site I want to crate an empty option tag using zend form.
  e.g.</p>
  
  <pre><code>&lt;select&gt;
  &lt;option&gt;&lt;/option&gt;
  &lt;option&gt;AAAAA&lt;/option&gt;
  &lt;option&gt;BBBBB&lt;/option&gt;
  &lt;option&gt;CCCCC&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>I have tried to do that with multi options array</p>
  
  <pre><code>$this-&gt;addElement ( 'select', 'selection', array (
                  'label' =&gt; 'Selection:',
                  'multiOptions' =&gt; array(''='', 'a'=&gt;'aaaa', 'b'='bbbb')
          ) );
  </code></pre>
  
  <p>But it gave me an html as follows</p>
  
  <pre><code>&lt;select&gt;
      &lt;option **label="" value=""**&gt;&lt;/option&gt;
      &lt;option&gt;AAAAA&lt;/option&gt;
      &lt;option&gt;BBBBB&lt;/option&gt;
      &lt;option&gt;CCCCC&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>