What a happy coincidence. During what was possibly the most traumatic two weeks in the country since the Great Depression, with the ongoing pandemic and racial unrest, I get a call from my friend, attorney E. Leonard Rubin, the former director of the CBA Bar Show, telling me I’ve got watch the London West End revival of “42nd Street,” which still appears on PBS’ “Great Performances” and is now also available for streaming on Broadway HD.When Lenny told me it was the best production of the musical he had ever seen, I needed …