##### SUMMARY

`mysql_info` module doesn't show empty DBs. It uses following query in the code:

```
MariaDB [(none)]> SELECT table_schema AS 'name', SUM(data_length + index_length) AS "size" FROM information_schema.TABLES GROUP BY table_schema;
+--------------------+-----------+
| name               | size      |
+--------------------+-----------+
| d106953_tm         | 470728704 |
| information_schema |    212992 |
| mysql              |   6038300 |
| performance_schema |         0 |
+--------------------+-----------+
4 rows in set (0,005 sec)
```
But `show databases` show something else;
```
MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| d106953_tm         |
| information_schema |
| innodb             |
| mysql              |
| performance_schema |
| testovic           |
| tm_web             |
| ttttt              |
+--------------------+
8 rows in set (0,001 sec)
```

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
`mysql_info` modules

##### ANSIBLE VERSION
```
ansible 2.9.1
  config file = /home/jiri/.ansible.cfg
  configured module search path = ['/home/jiri/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/jiri/stow/ansible/venv/lib/python3.6/site-packages/ansible
  executable location = /home/jiri/stow/ansible/venv/bin/ansible
  python version = 3.6.9 (default, Nov  7 2019, 10:44:02) [GCC 8.3.0]

```

##### OS / ENVIRONMENT
Amazon Linux 2
rh-mariadb103-3.3-5.el7.x86_64

##### STEPS TO REPRODUCE

* create empty via eg. via `mysql_db module`
* query via `mysql_info` what databases where found

##### EXPECTED RESULTS
should list even empty DBs

##### ACTUAL RESULTS

it seems only populated DBs are listed
description: Database size in bytes.
      returned: if not excluded by filter
      type: dict
      sample: { 'size': 656594 }
settings:
  description: Global settings (variables) information.
  returned: if not excluded by filter
  type: dict
  sample:
  - { "innodb_open_files": 300, innodb_page_size": 16384 }
global_status:
  description: Global status information.
  returned: if not excluded by filter
  type: dict
  sample:
  - { "Innodb_buffer_pool_read_requests": 123, "Innodb_buffer_pool_reads": 32 }
  version_added: "2.10"
users:
  description: Users information.
  returned: if not excluded by filter
  type: dict
  sample:
  - { "localhost": { "root": { "Alter_priv": "Y", "Alter_routine_priv": "Y" } } }
engines:
  description: Information about the server's storage engines.
  returned: if not excluded by filter
  type: dict
  sample:
  - { "CSV": { "Comment": "CSV storage engine", "Savepoints": "NO", "Support": "YES", "Transactions": "NO", "XA": "NO" } }
master_status: