FirestorePagingAdapter does not log errors by default

[sanisloandras]

Hello!

Recently I discovered that FirestorePagingAdapter does not log errors by default, while FirestoreRecylcerAdapter does.
I think it should save developers some time. I lost some time while debugging why my FirestorePagingAdapter didn't not display any data. I simply forgot to create an index, but I didn't get the warning log about that, because FirestorePagingAdapter's onError method body is empty.

FirestoreRecyclerAdapter:
@Override public void onError(@NonNull FirebaseFirestoreException e) { Log.w(TAG, "onError", e); }

FirestorePagingAdapter:
protected void onError(@NonNull Exception e) { // For overriding }

[samtstern]

@sanisloandras I think this is a great idea, would you like to submit a PR with this change?

[samtstern]

This has been released in FirebaseUI 6.1.0