[CLOUDSRV-1968] ti.cloudpush: Push Notifications- After a clean install, clicking on tray notifications on android devices will not bring the app to foreground

- Fix bug around TiApplication exception (no valid root or current activity found for application instance)
Merge pull request #3862 from realpaul/3_0_X

[CLOUDSRV-1968] Fix bug around TiApplication exception