commit 7d72ca0b20334aba077e3a01d7b12f6f34618076
author Kurt Partridge <kep@google.com> Thu May 09 14:25:28 2013 -0700
committer Kurt Partridge <kep@google.com> Fri May 10 18:21:08 2013 -0700
tree ca073e975d11d989859bd3e86f07c8d1084f4f56
parent 260df8419739f92d4c64abfedec448a7f447b3a1

Avoid JsonWriter multi-write error

JsonWriter requires that its clients pass it only a single top-level object.
The existing implementation tries to make code cleaner by having mJsonWriter
never be null, and instead use a global static "NULL_JSON_WRITER" that just
discards data.  But because JsonWriter complains if more than one top-level
object is passed, making this a global object does not work.  This change
instead copes with mJsonWriter being null.

Change-Id: Ia37ccfc8646e91f11a64713dd92d2846eb86ac54