#body_params should fallback to an empty hash

[cbeer]

No description provided.

[ndushay]

I asked @cbeer offline if there should be a test.

"the important parts are covered already, so this should just be a straight refactor. it just happens that what rails tests use and what passenger provides are slightly different."

LGTM. 👍 for merging

[ndushay]

"the problem is rack doesn’t define what request.body returns, and passenger chose something more restrictive than whatever the rails test harness provides."

[coveralls]

Coverage increased (+0.6%) to 98.558% when pulling b5b12dc on body-params-fallback into ce95e8d on master.