[fix] options css class

[fix] Color none set panel-default


(cherry picked from commit b27fe6eb)

options/options.twig

@@ -624,7 +624,7 @@
                                 <option value="panel">{{ gT("Panel wrapper") }}</option>
                             </select>
                         </div>
-                        <p class="help-block col-xs-12"><p>Option to add a border and coloured background for questions. <a href="https://getbootstrap.com/docs/3.3/components/#wells" target="_blank">Wells wrapper</a> uses rounded border. <a href="https://getbootstrap.com/docs/3.3/components/#panels-alternatives" target="blank">Panel wrapper</a> includes background colour.</p>
+                        <p class="help-block col-xs-12">Option to add border and colour for questions. <a href="https://getbootstrap.com/docs/3.3/components/#wells" target="_blank">Wells wrapper</a> uses rounded border. <a href="https://getbootstrap.com/docs/3.3/components/#panels-alternatives" target="blank">Panel wrapper</a> includes background colour.</p>
                     </div>
                 </div>
             </div>

views/subviews/survey/question_container.twig

@@ -115,7 +115,7 @@
     {% set start_panel_body = 1 %}
     {% set close_panel_body = 1 %}
     {% set panel_heading = 1 %}
-    {% if ( questioncolor ) %}
+    {% if ( questioncolor and questioncolor != 'none' ) %}
         {% set questioncontainerclass = 'panel panel-'~questioncolor %}
         {% set questioncolor = '' %}
     {% else %}