Tanya’s Score: Okay-and-a-half* Rated: PG Starring: Cinderella, an SNL player and Ed Sheeran Plot: After a worldwide power outage followed by a bump to the head, a struggling musician (Himesh Patel) wakes up to a world where the musical group The Beatles never existed. Tanya’s Verdict: What a disappointment. There was so much going for…