Raise the exception if not a 404

app/main/views/templates.py

@@ -199,6 +199,8 @@ def delete_service_template(service_id, template_id):
     except HTTPError as e:
         if e.status_code == 404:
             message = '{} has never been used'.format(template['name'])
+        else:
+            raise e
 
     flash('{}. Are you sure you want to delete it?'.format(message), 'delete')
     return render_template(