Fix import bug

[morganchen12]

Fixes #8599.

[paulb777]

Can you add a test to https://github.com/firebase/firebase-ios-sdk/blob/master/FirebaseAuth/Tests/Sample/SwiftApiTests/SwiftAPI.swift?

[paulb777]

Thanks Morgan. Is this the right fix versus making sure there is an error when nil is returned?

It seems that if an API claiming to return a FIRUser doesn't, it should provide an explanation as to why?

cc: @rosalyntan

[rosalyntan]

Is this the right fix versus making sure there is an error when nil is returned?

It seems that if an API claiming to return a FIRUser doesn't, it should provide an explanation as to why?

I think this seems right to me -- nil can be returned in the success case, it just means there is no user stored in the access group. There is an example in our docs that highlights this case.

[paulb777]

Thanks for the explanation Rosalyn. That makes sense to me. :)