title: Dandelion Datatables tag dt inside fragment
body: <p>When I create a thymeleaf fragment, dandelion <code>dt</code> attribute do not read the thymeleaf variables. </p>
  
  <p>I try to explain better with the code.</p>
  
  <p>Fragment</p>
  
  <pre><code>&lt;th:block layout:fragment="table"&gt;
          &lt;div dt:conf="${tableId}"&gt;
              &lt;div dt:confType="callback" dt:type="format" dt:function="formatNumberCallback"&gt;&lt;/div&gt;
          &lt;/div&gt;
          &lt;table th:id="${tableId}"
                 dt:table="true"
                 dt:ext="responsive"&gt;
              &lt;thead&gt;
                  &lt;tr&gt;
                      &lt;th:block layout:fragment="table-header"&gt;Default table header&lt;/th:block&gt;
                  &lt;/tr&gt;
              &lt;/thead&gt;
              &lt;tbody&gt;
                  &lt;th:block layout:fragment="table-content"&gt;Default table content&lt;/th:block&gt;
              &lt;/tbody&gt;
          &lt;/table&gt;
      &lt;/th:block&gt;
  </code></pre>
  
  <p>Page</p>
  
  <pre><code>&lt;div layout:include="fragments/components/table :: table" th:with="tableId='usersTableTest'" th:remove="tag"&gt;
                  Default
              &lt;/div&gt;
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>08:48:31,825 INFO  [stdout] (http-/127.0.0.1:8080-5)        org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'com.github.dandelion.datatables.thymeleaf.processor.config.DivConfTypeAttrProcessor' (fragments/components/table:11)
  08:48:31,825 INFO  [stdout] (http-/127.0.0.1:8080-5)    at org.thymeleaf.processor.AbstractProcessor.process(AbstractProcessor.java:225) ~[thymeleaf-2.1.4.RELEASE.jar:2.1.4.RELEASE]
  08:48:31,826 INFO  [stdout] (http-/127.0.0.1:8080-5)    at org.thymeleaf.dom.Node.applyNextProcessor(Node.java:1017) ~[thymeleaf-2.1.4.RELEASE.jar:2.1.4.RELEASE]
  08:48:31,826 INFO  [stdout] (http-/127.0.0.1:8080-5)    at org.thymeleaf.dom.Node.processNode(Node.java:972) ~[thymeleaf-2.1.4.RELEASE.jar:2.1.4.RELEASE]
  </code></pre>
  
  <p>In this case <code>th:id="${tableId}</code> work correctly but <code>dt:conf="${tableId}"</code> not work.</p>
  
  <p>Do you have suggestions?</p>