OPP: Check URI of sending files before entry cleanup.

Use Case:
1. Select a picture then share it via Bluetooth.
2. When the 'Bluetooth device chooser' page display,
   press home button to home page.
3. Turn off BT-> turn on BT->turn off BT.
4. Tap 'Bluetooth device chooser' from recent list,
   then press back/home/recent button.

Failure:
"Unfortunately, Bluetooth share has stopped" error comes.

Fix:
Checking the URI of sending files before removing the file entry
from Hashmap. Otherwise, during BT ON/OFF scenario there is a
possibility of URI becoming NULL that will lead to BT app crash

CRs-Fixed: 721360
Change-Id: Ic7e8966d38e30948228e14a740cd3051b345da31
3 files changed