mosquitto_pub now sends 0 length files without an error when using `-f`.

ChangeLog.txt

@@ -53,6 +53,7 @@ Clients:
 - Add `--random-filter` to mosquitto_sub, to allow only a certain proportion
   of received messages to be printed.
 - mosquitto_sub %j and %J timestamps are now in a ISO 8601 compatible format.
+- mosquitto_pub now sends 0 length files without an error when using `-f`.
 
 
 1.6.9 - 20200227

client/pub_shared.c

@@ -99,8 +99,9 @@ int load_file(const char *filename)
 		return 1;
 	}else if(cfg.msglen == 0){
 		fclose(fptr);
-		err_printf(&cfg, "Error: File \"%s\" is empty.\n", filename);
-		return 1;
+		cfg.message = NULL;
+		cfg.msglen = 0;
+		return 0;
 	}else if(cfg.msglen < 0){
 		fclose(fptr);
 		err_printf(&cfg, "Error: Unable to determine size of file \"%s\".\n", filename);