Remove unnecessary null check

Null check after call to constructor
fix crash importing/capturing on 4.0, 4.1, 4.2 and 4.3 devices
fix capture on note2; add support for file:// media uris
bumping to v2.0.0-build1018
revised HomeActivity to use new instance index
Merge branch 'secureshare' of https://github.com/guardianproject/storymaker into secureshare
fix scroll in empty story crash and updates to download checks
Merge pull request #89 from mnbogner/secureshare

revised HomeActivity to use new instance index
Merge branch 'secureshare' of https://github.com/guardianproject/storymaker into secureshare