Coerce the absence of body into the empty body

[WonderCsabo]

Fixes #25.

[royclarkson]

@WonderCsabo thanks for the PR. I'm hoping to have time over the upcoming holidays to work on this and do some testing. If you can add a few tests, that would be a big help. I'll plan on pushing out a 2.0.0.M4 or RC1 with this change, and you can use that to validate against your code.

[WonderCsabo]

Thanks for the feedback. Can you point me to some example tests for request factories? I already tested this against my code BTW.

[royclarkson]

Here are the related OkHttp tests. Thanks for the help.

https://github.com/spring-projects/spring-android/blob/master/test/spring-android-rest-template-test/src/main/java/org/springframework/http/client/OkHttpClientHttpRequestFactoryTests.java

[WonderCsabo]

@royclarkson I added a test. This fails before my fix and passes with may fix. The failure is exactly the same which i experienced in my real app.

[royclarkson]

Excellent. Thanks again for the help.

[WonderCsabo]

Any chance to check this out @royclarkson?

[ollide]

Any update on this? A 2.0.0.M4 release containing the fix would be really nice 👍

[WonderCsabo]

@royclarkson thanks for merging this finally. ☺️

[royclarkson]

I know. :( too much going on. I'm pushing out a 2.0.0.M4 to get this in a release. We can figure out the OkHttp3 stuff in #29.