add layout false to prevent default layout rendering

layout false is added so that application.haml doesnt render while generating pdf, xlsx or csv as it is not required in their templates

app/controllers/admin/events_controller.rb

@@ -28,12 +28,12 @@ module Admin
         format.json { render json: Event.where(state: :confirmed, program: @program).to_json }
         format.xlsx do
           response.headers['Content-Disposition'] = "attachment; filename=\"#{@file_name}.xlsx\""
-          render 'events'
+          render 'events', layout: false
         end
-        format.pdf { render 'events' }
+        format.pdf { render 'events', layout: false }
         format.csv do
           response.headers['Content-Disposition'] = "attachment; filename=\"#{@file_name}.csv\""
-          render 'events'
+          render 'events', layout: false
         end
       end
     end