Mms: Fix crash when adding an audio from external audio

It is the NullPointerException which cause application crash.
In this case, when getting uri, it only get ParcelableExtra
from data, but MusicPicker set result uri by setData method.

Check the uri after getParcelableExtra, if the uri is null,
get it by getData method directly.

CRs-Fixed: 749622

Change-Id: I166b7fa801e0f1e66f72d6f1accddf10792bb323