Hide exception in ObjectCountsWidget for models without a `xxx_list` view function (#17342)

* Hide exception in ObjectCountsWidget for models without a `xxx_list` view function

Fixes #17341

* Disable hyperlink for invalid view names

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

netbox/extras/dashboard/widgets.py

@@ -183,10 +183,13 @@ class ObjectCountsWidget(DashboardWidget):
         for model in get_models_from_content_types(self.config['models']):
             permission = get_permission_for_model(model, 'view')
             if request.user.has_perm(permission):
-                url = reverse(get_viewname(model, 'list'))
+                try:
+                    url = reverse(get_viewname(model, 'list'))
+                except NoReverseMatch:
+                    url = None
                 qs = model.objects.restrict(request.user, 'view')
                 # Apply any specified filters
-                if filters := self.config.get('filters'):
+                if url and (filters := self.config.get('filters')):
                     params = dict_to_querydict(filters)
                     filterset = getattr(resolve(url).func.view_class, 'filterset', None)
                     qs = filterset(params, qs).qs

netbox/templates/extras/dashboard/widgets/objectcounts.html

@@ -3,7 +3,7 @@
 {% if counts %}
   <div class="list-group list-group-flush">
     {% for model, count, url in counts %}
-      <a href="{{ url }}" class="list-group-item list-group-item-action px-1 py-2">
+      <a {% if url %}href="{{ url }}" {% endif %}class="list-group-item list-group-item-action px-1 py-2">
         <div class="d-flex w-100 justify-content-between align-items-center">
           {{ model|meta:"verbose_name_plural"|bettertitle }}
           {% if count is None %}