Possible error no data when two clients ask for the same server at the same time

[NJAldwin]

Due to the way locking is done, if data is malformed or nonexistent and a process is already fetching data for the server (that is, has a lock on that server), the error 'no data' is returned. Instead, perhaps it should wait for the lock to be resolved or return a 'retry' response of some kind...