Fix for raw() parser if body is empty

[Olivier-OH]

Set it to empty string rather than an empty Object.

See issue #187

[Olivier-OH]

Unit tests don't pass because somewhere an empty object is expected instead of an empty string.

I don't know whether I should change the unit test code. Is this important that the body is an empty object instead of an empty string?

[Olivier-OH]

I changed the unit test code. I'll let the repo owners decide whether this is correct.

[dougwilson]

Hi @Olivier-OH, defaulting to a string in the raw parser does not make sense, since a successful raw parse results in a Buffer object, not a string. Besides, we actually went ahead and fixed these semantics in the 2.0 branch. Please go ahead and check out the proposed 2.0 release in #66 :)

[Olivier-OH]

Great! Thanks for your feedback.