[plotters] delete action button only if not report uses the plotterparameter

beat/web/plotters/templates/plotterparameters/panels/actions.html

@@ -23,10 +23,11 @@
 
 <div class="btn-group btn-group-sm action-buttons pull-right">
 
+  {% visible_reports object as reports %}
+
   {% if display_count %}
   <!-- Experiment count, works for all -->
 
-  {% visible_reports object as reports %}
 
   <a class="btn btn-default btn-references" href="{{ object.get_absolute_url }}#reports" data-toggle="tooltip" data-placement="bottom" title="Reports using this plotterparameter"><span class="badge">{{ reports.count }}</span></a>
   {% else %}
@@ -47,7 +48,7 @@
 
 
     <!-- Delete, needs to be the owner -->
-    {% if object.deletable %}
+    {% if object.deletable and reports.count == 0 %}
     <a class="btn btn-default btn-delete" onclick="modal_delete('plotterparameter', '{{ object.fullname }}', '{% url 'api_plotters:all_plotterparameter' %}', '{% url 'plotters:plotterparameter-list' request.user.username %}');" data-toggle="tooltip" data-placement="bottom" title="Delete"><i class="fa fa-times fa-lg"></i></a>
     {% endif %}