fix(android): Error is null on invalidateEnrollment set to false

[denissb]

This will throw an error like the following when the data has been invalidated upon changes to biometric data.

I made an attempt at a fix for #257

Error: Invalid argument
    at Object.promiseMethodWrapper [as getItem] (NativeModules.js:103)
    at _callee3$ (index.bundle?platform=android&dev=true&minify=false&modulesOnly=true&runModule=false&shallow=true:sourcemap:131)
    at tryCatch (runtime.js:63)
    at Generator.invoke [as _invoke] (runtime.js:293)
    at Generator.next (runtime.js:118)
    at tryCatch (runtime.js:63)
    at invoke (runtime.js:154)
    at runtime.js:164
    at tryCallOne (core.js:37)
    at core.js:123

[mCodex]

@denissb thanks!!