[2.3.x] Incremental changes for https://java.net/jira/browse/GRIZZLY-1535 (CompressionEncodingFilter throws NPE)
  - waiting for additional details as I'm unable to reproduce the problem.  The code changes only address the NPE.
[2.3.x] Fix a stupid mistake...
(cherry picked from commit 84bc1f4cce7a284356b008c3d4114793af04972d)