onError method
Called whenever an error is thrown in any Bloc or Cubit.
The stackTrace argument may be StackTrace.empty if an error
was received without a stack trace.
Implementation
@override
@mustCallSuper
void onError(BlocBase bloc, Object error, StackTrace stackTrace) {
super.onError(bloc, error, stackTrace);
_talker.error('${bloc.runtimeType}', error, stackTrace);
}