Fix for BUG#2452 "Empty LOAD DATA INFILE failes with the master in 3.23.x":

do not write the Execute_load_log_event if there was no Create_file_log_event
(empty file).

sql/slave.cc

@@ -2840,6 +2840,14 @@ static int process_io_create_file(MASTER_INFO* mi, Create_file_log_event* cev)
       if (unlikely(!num_bytes)) /* eof */
       {
        send_ok(net); /* 3.23 master wants it */
+       /*
+         If we wrote Create_file_log_event, then we need to write
+         Execute_load_log_event. If we did not write Create_file_log_event,
+         then this is an empty file and we can just do as if the LOAD DATA
+         INFILE had not existed, i.e. write nothing.
+       */
+       if (unlikely(cev_not_written))
+         break;
        Execute_load_log_event xev(thd,0,0);
        xev.log_pos = mi->master_log_pos;
        if (unlikely(mi->rli.relay_log.append(&xev)))