Don't initialise the session unless you need to.
Don't initialise the session unless you need to.

If you run in production mode ```NODE_ENV=production``` this will produce warnings
because it will use MemoryStore. Although the session may never be getting written to
it's a red herring and is undesirable for both logging and developers sanity.

UKHomeOffice/passports-form-wizard,UKHomeOffice/passports-form-wizard