Fix admin/users/index.html.haml view spec

spec/views/admin/users/index.html.haml_spec.rb

@@ -2,6 +2,7 @@ require 'rails_helper'
 
 describe 'admin/users/index' do
   it 'includes "Send email to users" link' do
+    allow(view).to receive(:container_class).and_return('ignored')
     assign(:users, User.all.page(1))
 
     render