title: typolink with empty value
body: <p>I try to create a typolink with no Text in it. The result should be:</p>
  
  <pre><code>&lt;a href="/index.php?id=123"&gt;‌&lt;/a&gt;
  </code></pre>
  
  <p>I have 2 work arounds so far: </p>
  
  <p><strong>adding a non-printing character:</strong></p>
  
  <pre><code>lib.mylink = TEXT
  lib.mylink .value = &amp;zwnj;
  lib.mylink .typolink.parameter.field = field_link
  </code></pre>
  
  <p>Result:</p>
  
  <pre><code>&lt;a href="/index.php?id=123"&gt;‌&amp;zwnj;&lt;/a&gt;
  </code></pre>
  
  <p><strong>adding a comment:</strong></p>
  
  <pre><code>lib.mylink = TEXT
  lib.mylink .value = &lt;!-- empty --&gt;
  lib.mylink .typolink.parameter.field = field_link
  </code></pre>
  
  <p>Result:</p>
  
  <pre><code>&lt;a href="/index.php?id=123"&gt;‌&lt;!-- empty --&gt;&lt;/a&gt;
  </code></pre>
  
  <p>Is it possible to get <code>&lt;a href="/index.php?id=123"&gt;‌&lt;/a&gt;</code> without a work around?</p>