Fix app crashes - fail safely

Created by: kost

This patch fixes few app crashes. It will try to fail safely if intent is not available or services are not reachable.

For example, there is no written requirement for jackpal android terminal emulator: http://www.nethunter.com/prepare/

but if android terminal is not installed, this application will die in terrible death (Nethunter ended unexpectedly..) when you try to launch kali in terminal (or any other which requires android terminal). This patch tries to fail safely, so app will not crash, but it will tell user that android terminal is missing.

Another fix is array handling and if services are not available. Again, app will die by terrible death.