Treat default value that wasn't found as empty value.

Fixes http://code.google.com/p/android/issues/detail?id=33220

Change-Id: If22e8b245f688d922c168aa54c8acf743c0644d7
Signed-off-by: houst0nn <houstonn@gmail.com>
Merge pull request #1 from AOSPA-legacy/lollipop

Treat default value that wasn't found as empty value.