[Android] Prevent crashes with null check for saved call (Fixes #368)

[kentwilliams-stripe]

cc @rdlabo @Julian-Sam

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[yankostadinov]

this should remove the errors for "callback resolve is not a method"

[rdlabo]

Thanks for creating pull request.

Is it a Stripe Android SDK spec that onVerificationCompleted and onVerificationCancelled are called multiple times? If so, call.resolve should be removed. ( But in that case, I think you should modify the Stripe Android SDK )

If we accept this change, I will make to be deprecate the following

const result = await StripeIdentity.present();

And it should be recommended that the result be obtained only on events. But did you eventually reproduce the problem? I am at a loss to get pull requests for problems that can't reproduce.

[rdlabo]

Another idea is to provide an argument to initialize with ignoreNativeError: boolean. And maintain documentation.

For plugin users, errors are important information to distinguish between successful and unsuccessful implementations. I would not want to inadvertently respond to errors that cannot be reproduced.