Sweeping !1584 from master to devel: BK API Fixes
When checking that SMOG2 is really working throw DiracLHCb API, I hit some "user unfriendly" behavior:
- EventType default to 'All', which is technically not allowed (must be a number, propagated up to Oracle which return confusing error)
- When no files found for selection, misleading exception is thrown instead of mentioned the fact.