BAU: add test for new error page title logic
BAU: add test for new error page title logic

Add a test to application_helper_spec which tests the case of flash[:errors] is not empty

Authors: bb76d3ec9612766873318e8bc7df302da76cbee1@michaelWalker

alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend