Detect Django's debug mode and render the server side error page properly.

Signed-off-by: Eric Riggs <ericriggs42@gmail.com>

mayan/apps/appearance/static/appearance/js/partial_navigation.js

@@ -143,6 +143,9 @@ PartialNavigation.prototype.processAjaxRequestError = function (jqXHR) {
      * user.
      */
 
+    if (djangoDEBUG) {
+        $('#ajax-content').html('<pre class="text-primary" style="background-color:#ffe7ae"><code>' + jqXHR.responseText + '</code></pre>');
+    } else {
       if (jqXHR.status == 0) {
           $('#modal-server-error .modal-body').html($('#template-error').html());
           $('#modal-server-error').modal('show')

mayan/apps/appearance/templates/appearance/root.html

@@ -170,6 +170,7 @@
             {# Transfer variable from Django to javascript #}
             var initialURL = '{% url home_view %}';
             Dropzone.autoDiscover = false;
+	    var djangoDEBUG = {% if debug %}true{% else %}false{% endif %};
 	</script>
 
         <script src="{% static 'appearance/js/base.js' %}" type="text/javascript"></script>