title: Error generating docx with opentbs : the textbox tag disappear
body: <p>I'm trying to use OpenTBS on my project to generate automatically a Resume using a word template (.docx)</p>
  
  <p>the template contains multiple images for the frame of the template.</p>
  
  <p>when I try to generate the file with my data, i noticed with the debug option that the opening tags  disappear when I use block=tbs:row inside.</p>
  
  <p>here is my php code : </p>
  
  <pre><code>$domains=array(
          array('id1'=&gt;"xxx",'id2'=&gt;"xxx"),
          array('id1'=&gt;"yyyy",'id2'=&gt;"yyyy"),
          //...
  );
  $tbs-&gt;LoadTemplate('mytemplate.docx', OPENTBS_ALREADY_UTF8);
  $tbs-&gt;MergeBlock('domain', $domains);
  </code></pre>
  
  <p>on my docx side :</p>
  
  <pre><code>[domain.id1;block=tbs:row] :
  [domain.id2] 
  </code></pre>
  
  <p>these tags are inside a table which is inside a textbox.</p>
  
  <p>after 2 days debugging I realized that some opening textbox tags disappear on generation causing an xml parsing error opening the document</p>
  
  <p>edit : After some other tests, it's when I use the block tag inside a textbox that the bug appears. </p>
  
  <p>thanks for your help.</p>
  
  <p>Matt.</p>