##### SUMMARY
Hi,

When you want to pass an empty list or a null/None value to published_ports on docker_container it's actually impossible, so you get this error

```
File \"/tmp/ansible_docker_container_payload_ZOZc5l/__main__.py\", line 1448, in _parse_publish_ports\r\n  File \"/tmp/ansible_docker_container_payload_ZOZc5l/__main__.py\", line 1003, in parse_port_range\r\nValueError: invalid literal for int() with base 10: ''\r\n",
 ```

Ref #61602

The problem is that we parse via `_parse_publish_ports` the parameter if self.published_ports is not None or not 'all'
Also after that there is no control on each elements of the list, (not like for the volumes parameter by example)

So I propose to patch line 1151
`self.published_ports = self._parse_publish_ports() `
to
`self.published_ports = self._parse_publish_ports() if self.published_ports else None`

Best regards

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
* docker_container

##### ANSIBLE VERSION

```
ansible 2.8.4
```
- A value of C(all) will publish all exposed container ports to random host ports, ignoring
        any other mappings.
      - If C(networks) parameter is provided, will inspect each network to see if there exists
        a bridge network with optional parameter com.docker.network.bridge.host_binding_ipv4.
        If such a network is found, then published ports where no host IP address is specified
        will be bound to the host IP pointed to by com.docker.network.bridge.host_binding_ipv4.
        Note that the first bridge network with a com.docker.network.bridge.host_binding_ipv4
        value encountered in the list of C(networks) is the one that will be used.
    type: list
    aliases:
      - ports
  pull:
    description:
       - If true, always pull the latest version of an image. Otherwise, will only pull an image
         when missing.
       - I(Note) that images are only pulled when specified by name. If the image is specified
         as a image ID (hash), it cannot be pulled.
    type: bool
    default: no
  purge_networks:
    description:
       - Remove the container from ALL networks not included in C(networks) parameter.
       - Any default networks such as I(bridge), if not found in C(networks), will be removed as well.
    type: bool
    default: no
    version_added: "2.2"
  read_only:
    description:
      - Mount the container's root file system as read-only.
    type: bool