Bug: RequestFactory with empty data

[peterschutt]

Description

Accessing Request.body() on a request constructed with RequestFactory where data={} raises RuntimeError.

URL to code causing the issue

No response

MCVE

-console
(starlite-py3.8) peter@peter-Inspiron-15-5510:~/PycharmProjects/starlite$ python -m asyncio
asyncio REPL 3.8.15 (default, Oct 17 2022, 12:54:29) 
[GCC 9.4.0] on linux
Use "await" directly instead of "asyncio.run()".
Type "help", "copyright", "credits" or "license" for more information.
>>> import asyncio
>>> from starlite.testing import RequestFactory
>>> await RequestFactory().post(data={}).body()
Traceback (most recent call last):
  File "/home/peter/.pyenv/versions/3.8.15/lib/python3.8/concurrent/futures/_base.py", line 444, in result
    return self.__get_result()
  File "/home/peter/.pyenv/versions/3.8.15/lib/python3.8/concurrent/futures/_base.py", line 389, in __get_result
    raise self._exception
  File "<console>", line 1, in <module>
  File "/home/peter/PycharmProjects/starlite/starlite/connection/request.py", line 147, in body
    self._body = self.scope["_body"] = b"".join([c async for c in self.stream()])  # type: ignore[typeddict-unknown-key]
  File "/home/peter/PycharmProjects/starlite/starlite/connection/request.py", line 147, in <listcomp>
    self._body = self.scope["_body"] = b"".join([c async for c in self.stream()])  # type: ignore[typeddict-unknown-key]
  File "/home/peter/PycharmProjects/starlite/starlite/connection/request.py", line 119, in stream
    while event := await self.receive():
  File "/home/peter/PycharmProjects/starlite/starlite/connection/base.py", line 40, in empty_receive
    raise RuntimeError()
RuntimeError

Steps to reproduce

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Screenshots

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Logs

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Starlite Version

main

Platform

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