Improve stats-UI fix (#5243)

* Improve stats-UI fix

* remove unused stats_json

src/pretix/control/templates/pretixcontrol/items/question.html

@@ -59,7 +59,7 @@
         </form>
     </div>
 
-    <div class="row" id="question-stats">
+    <div class="row">
         {% if not stats %}
             <div class="empty-collection col-md-10 col-xs-12">
                 <p>
@@ -81,7 +81,7 @@
                 <div class="chart" id="question_chart" data-type="{{ question.type }}">
 
                 </div>
-                <script type="application/json" id="question-chart-data">{{ stats_json|escapejson }}</script>
+                {{ stats|json_script:"question-chart-data" }}
             </div>
             <div class="col-md-5 col-xs-12">
                 <table class="table table-bordered table-hover">

src/pretix/control/views/item.py

@@ -748,7 +748,6 @@ class QuestionView(EventPermissionRequiredMixin, QuestionMixin, ChartContainingV
         ctx['items'] = self.object.items.all()
         stats = self.get_answer_statistics()
         ctx['stats'], ctx['total'] = stats
-        ctx['stats_json'] = json.dumps(stats)
         return ctx
 
     def get_object(self, queryset=None) -> Question: