Fix for #1787 addresses NPE but does not appear to resolve underlying issue

[sheamartinson]

• Environment
  Android studio version: 4.0.1
  Firebase component: firebase-installations
  Component version: 16.3.3

• The problem
  In issue NullPointerException on FirebaseInstallations.registerFidWithServer #1787 the merged fix seems to only address the NPE and not the installation state that caused it. The issue will still exist for devices upgrading from 16.3.2 -> 16.3.3 that the FirebaseInstallation.* file will be persisted with a missing fid and a status=5. The NPE won't be thrown anymore, but it seems as though the error state can't be corrected.

Manually deleting the file resolves the issue on the next initialisation.

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.