As the audience filed into Hollywood’s Dolby Theatre for the This Is Us panel at PaleyFest, boxes of tissues were handed to anticipate all the tears that would be shed after watching an episode of the Emmy-winning NBC family drama. Actually, boxes of tissues weren’t handed out, but PaleyFest screened the most recent episode of the show which definitely stirred many emotions and gutted us — which is why This Is Us has become a source of must-see TV in a when all of us just…