Issue #2978024 by Akhil Babu, dan612, smustgrave, quietone, elaman, harshil_jadav: Allow "Content ID from URL" contextual filter to recognize node previews

Issue #2778917 by kiamlaluno, jungle, elaman, dawehner, alexpott, tvb, vadim.hirbu, ravi.shankar, quietone: Use the second parameter of \Drupal::state()->get() instead of checking the method didn't return any value