Added hidden <input> element to radio buttons

mockup/personmock.html

@@ -218,6 +218,8 @@
                         <p class="help-block"></p>
                     </div>
                 </div>
+                <!-- This must be outside the form-group. -->
+                <input name="gender" value="" type="hidden">
 
 
                 <div class="form-group">