fix issue where body can be empty data on a put/post

[jsjames]

Fixes #3340

Currently when the body data is an empty array or empty object, the stripEmptySlots method will delete the body from the params, which then causes the POST / PUT to not succeed. This ensures that the body is never deleted and only gets added to the params of a PUT/POST when it is defined as a parameter.

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[jsjames]

@mrlubos - was wondering if you could help out with this one. This is preventing us from extending hey-api in a few areas in the openhab app.

[mrlubos]

@jsjames I'll reply to the issue