cleanup in html template + tidylib

* few small cleanup in html template (avoid empty tbody, put id between
quotes)
* switch to tidylib to validate the html instead of the previous hack
calling an external service (https://html5.validator.nu/)
* remove the previous validator script
* add exception for tidylib on empty <span> (these are required by
bootstrap)

resources/templates/adduser.tmpl

@@ -6,7 +6,7 @@
         </div>
         <div class="col-md-12 column">
             <div class="well well-sm">
-              <form method='POST' autocomplete="off" action='/adduser' role="form" class="form-signin" id=form>
+              <form method='POST' autocomplete="off" action='/adduser' role="form" class="form-signin" id="form">
               <fieldset>
               <legend>Fill new user's attributes:</legend>
               ${form | n}

resources/templates/base.tmpl

@@ -70,6 +70,6 @@
         <p class="muted credit"><a href="http://ldapcherry.readthedocs.org" target="_blank">LdapCherry</a> • © 2016 • Pierre-François Carpentier • Released under the MIT License</p>
       </div>
     </div>
-</body>
 <script type="text/javascript" src="/static/js/alignforms.js"></script>
+</body>
 </html>

resources/templates/index.tmpl

@@ -11,8 +11,8 @@
               </div>
               <div class="panel-body">
 		<table id="RecordTable" class="table table-hover table-condensed">
-		<tbody>
 		% if not searchresult is None:
+		<tbody>
                      %for attr in sorted(attrs_list.keys(), key=lambda attr: attrs_list[attr]['weight']):
                      <tr>
                              % if attr in searchresult:
@@ -26,8 +26,8 @@
                              % endif
                      </tr>
                      % endfor
-		%endif
 		</tbody>
+		%endif
                 </table>
                 </div>
               </div>