Prevent nullPointerException by updateBondedBluetoothDevices

In some very rare cases difficult to identify, it seems that the
IBluetooth.getBondedDevices() returns a Set with a null element.

This patch will prevent calling getBondState() if the device is null to
avoid a nullPointerException.

Change-Id: I9bcad60c37e03c77ec39227e5c947c002a3ae2c7
Orig-Change-Id: I8845f0e6b8fdcda679bc71e2b5c33fd4a52f3ac5
Signed-off-by: Patrick Combes <patrick.combes@intel.com>
Reviewed-on: http://android.intel.com:8080/116592
Reviewed-by: Bondier, CedricX <cedricx.bondier@intel.com>
Reviewed-by: Chen, HuaqiangX <huaqiangx.chen@intel.com>
Reviewed-by: Yao, Yong <yong.yao@intel.com>
Reviewed-by: Aquilone, RaffaeleX <raffaelex.aquilone@intel.com>
Tested-by: Lestienne, ChristopheX <christophex.lestienne@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
Signed-off-by: Jian Luo <jian.luo@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 90085