Revert changes in PR #4003 (#4263)

Summary:
Revert this change. Not generating the OnTableFileCreated() notification for a 0 byte SST on flush breaks the assumption that every OnTableFileCreationStarted() notification is followed by a corresponding OnTableFileCreated().
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4263

Differential Revision: D9285623

Pulled By: anand1976

fbshipit-source-id: 808c3dcd498b4b4f4ed4be947a29a24b2296aa8d

db/builder.cc

@@ -230,11 +230,9 @@ Status BuildTable(
   }
 
   // Output to event logger and fire events.
-  if (!s.ok() || meta->fd.GetFileSize() > 0) {
   EventHelpers::LogAndNotifyTableFileCreationFinished(
       event_logger, ioptions.listeners, dbname, column_family_name, fname,
       job_id, meta->fd, tp, reason, s);
-  }
 
   return s;
 }