square/okio — pull request #100 by JakeWharton (2014-12-26 11:03:19+00:00)
Title: Do not call through to Source on zero byte count write.

This ensures that a zero byte count never calls through to read the source. It may be tied to something like a socket which will potentially block trying to read a segment when ultimately we don't want any data.

Multiple instances of this bug occurring @ https://github.com/square/okhttp/pull/1241/files#r22281975