[BUG] Mydumper couldn't dump a database without any table

[Suarez1024]

Describe the bug

Mydumper couldn't dump a database without any table.

To Reproduce
Command executed:

• mydumper with all the parameters

./mydumper --host 'XXX' --port 3306 --user 'root' --password 'XXX' --outputdir 'antData3/' --verbose 3

What mydumper and myloader version has been used?

v0.12.3-1

Expected behavior
I'm sure mydumper v0.11.3 could dump a database without any tables. I think it's a bug in new version.

**Log**
** Message: 16:34:10.878: MyDumper backup version: 0.12.3-1
** Message: 16:34:10.885: Server version reported as: 5.7.25-log
** Message: 16:34:10.888: Connected to a MySQL server
** Message: 16:34:10.891: Acquiring FTWRL
** Message: 16:34:10.894: Started dump at: 2022-05-19 16:34:10
** Message: 16:34:10.896: Written master status
** Message: 16:34:10.903: Thread 1 connected using MySQL connection ID 140189
** Message: 16:34:10.913: Thread 2 connected using MySQL connection ID 140190
** Message: 16:34:10.923: Thread 3 connected using MySQL connection ID 140191
** Message: 16:34:10.933: Thread 4 connected using MySQL connection ID 140192
** Message: 16:34:10.941: Thread 3 dumping db information for `luna`
** Message: 16:34:10.941: Thread 1 dumping db information for `mao1`
** Message: 16:34:10.941: Thread 2 dumping db information for `mysql`
** Message: 16:34:10.941: Thread 4 dumping db information for `syncer_meta_schema`
** Message: 16:34:10.943: Thread 3 dumping db information for `sys`

luna is a new database without any table. This database is mentioned in the logs. However, there are no files related to this database in the dumped folder.

# ls antData3 | grep schema-create
mao1-schema-create.sql
mysql-schema-create.sql
syncer_meta_schema-schema-create.sql
sys-schema-create.sql

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| luna               |
| mao1               |
| mysql              |
| performance_schema |
| syncer_meta_schema |
| sys                |
+--------------------+
7 rows in set (0.01 sec)

mysql> use luna;
Database changed
mysql> show tables;
Empty set (0.00 sec)