null path with no body fix.

[nmondal]

Fixing the issue that when response is null, and body() is not set, 404 gets generated.
#3

[hemil-ruparel-blox]

I think we should return empty string because null is the absence of a request body. Which in our case would be an empty string

[nmondal]

I think we should return empty string because null is the absence of a request body. Which in our case would be an empty string

Actually I thought about it, and then it seems json string of null is "null". Hence returning null.