This morning I found Papa Bird agitated. The nest had fallen and at least one egg broke. He was flapping his wings, looking downwards at the nest, then flying from one place to another. I'm sure his thought was "I messed up big time. I'm going to be in trouble with Mama bird."
I'm too short to put the nest back. (And I would definitely be wearing gloves to save myself from the dove poo.) I don't know if there is a second egg that survived the fall.