Add missing null check in HomeVisibilityListener

import android.annotation.SuppressLint;

import android.annotation.SystemApi;

import android.annotation.TestApi;

import android.content.ComponentName;

import android.content.Context;

import android.os.Binder;

        }

        // We can assume that the screen is idle if the home application is in the foreground.

        String defaultHomePackage = mContext.getPackageManager()

                .getHomeActivities(new ArrayList<>()).getPackageName();

        if (Objects.equals(top, defaultHomePackage)) {

            return true;

        }

        ComponentName defaultHomeComponent = mContext.getPackageManager()

                .getHomeActivities(new ArrayList<>());

        if (defaultHomeComponent == null) return false;

        return false;

        String defaultHomePackage = defaultHomeComponent.getPackageName();

        return Objects.equals(top, defaultHomePackage);

    }

}