tree a8e3ef7c71386ac617b48d9f18ca19edfb7e33a5
parent c4351c791052ad529a4e83c600b1aa6e6420ea86
author Doug Zongker <dougz@android.com> 1267052627 -0800
committer Doug Zongker <dougz@android.com> 1267052707 -0800

make StringValue wrapper okay to call on NULL

The docs say "don't do this", but it's trivial to make safe.  Make
StringValue(NULL) return NULL instead of crashing.

Change-Id: I2221bcb4c98d8adb4e25c764d7bdcfa787822bcf