Kill output if response cannot have a body

[recess]

When returning items that don't necessarily have a body (or a view!) i.e. a temporary redirect from a controller, rather than error'ing out in kill the output (but still send the headers) if no view is available.

Some initial thoughts on fix for this:

• a change in the default policy
• a back-up view that takes lower priority than all other views but traps specific response codes (i.e. ones that typically involve the browser redirecting)