- Handles condition where IterableKeychain creation returns null to Iterable API.
SDK will continue to process without crashing.
There will be no email fetched from sharedPreferences in this rare case. No email will be persisted and the app will have to setEmail/setUserId on every app session for it to have email in memory than having it persisted for consequent app sessions

- Fixed indentation on IterableKeychain file. Using cmd+l on Android Studio

- Added method description in IterableConfig class so developers have more context on what `setEncryptionEnforced` means

- getKeychain is now annotated @nullable for future kotlin migration purpose

1. Checking for Throwable which will collect both Exception and Error if at all Security library is crashing with a Error and not exception.
2. Updating the dependency to use latest alpha version. Alpha version 5 also seems to fix race condition during creation process.
Reference - https://developer.android.com/jetpack/androidx/releases/security#1.1.0-alpha05
3. Added some warning logs if this situation arrives so developers can take some action if it occurs during debugging

Catching Error along with Exception