SERVER-34211 added code to guard against closeAll throwing an exception and potentially leaving the oplog pointer uninitialized.

However, this code can be triggered on standalones, hitting the invariant that the oplog collection exists.

As for the suggested fix, I've talked with kyle.suarez@mongodb.com and we believe the guard from SERVER-34211 is no longer necessary and can be removed. Specifically,
SERVER-35671 moved the uassert such that if its triggered, the catalog is left in a consistent state.