Null safety required for Firebase AppInstanceId retrieval

[pavitrapandey]

The code in LauncherActivity uses FirebaseAnalytics.getAppInstanceId() without checking if task.getResult() is null. If the result is null, adding it to mQueryParams could lead to a crash or incorrect behavior. Adding a null check would make this code more robust.

[idoshamun]

Hi @pavitrapandey,

Feel free to contribute this fix. Thanks a lot for reporting!