One option:
Make sure your data provider always returns at least one result record. You could create a UNION query to fetch at least one record. You will have to filter out this “dummy” record within your report though.
Also, take a look at this thread: No data to fetch
which I found doing a simple SEARCH on Bob 
Or look at the FAQ: Reporter section, where Cindy posted the possible answers (again I found this entry via Search is Your Friend at BOB).
Andreas 
(BOB member since 2002-06-20)