StorageManager: fix android.process.media process stop while plug a discontinuous partitioned SD Card

While get volume state, throw an IllegalArgumentException, catch
this exception in StorageManager and return null to MtpService to
avoid process stoping.

Change-Id: Iebb5c38e375d3f54505d9b9d64fcd0f02a2b60c1
Author: Li Gang <gang.g.li@intel.com>
Signed-off-by: Li Gang <gang.g.li@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 47459
allow wallpaper cropper to read sdcard

Change-Id: I8f32b5bbfea33d732320b3ac29da6b0027fbd999