##### SUMMARY
When specifying only action name and state "absent", that fails with "missing required arguments: event_source".
Zabbix action names are unique across types (event sources), thus the event source parameter in this case is not mandated by the Zabbix API.
It would be great to either lift this limitation, or add an example in the documentation explaining why it's there.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
zabbix_action

##### ANSIBLE VERSION
latest

##### CONFIGURATION
Not relevant.

##### OS / ENVIRONMENT
Not relevant.

##### STEPS TO REPRODUCE

```yaml
  - name: "Report problems to Zabbix administrators"
    state: absent
```

##### EXPECTED RESULTS
Either success, or documented special limitation.

##### ACTUAL RESULTS
```
failed: [host] (item={u'state': u'absent', u'name': u'Report problems to Zabbix administrators'}) => {"ansible_loop_var": "item", "changed": false, "item": {"name": "Report problems to Zabbix administrators", "state": "absent"}, "msg": "missing required arguments: event_source"}
```
'password': operation.get('password'),
                'port': operation.get('port')
            }
        except Exception as e:
            self._module.fail_json(msg="Failed to construct operation command. The error was: %s" % e)
    def _construct_opcommand_hst(self, operation):
        """Construct operation command host.
        Args:
            operation: operation to construct command host
        Returns:
            list: constructed operation command host
        """
        if operation.get('run_on_hosts') is None:
            return None
        return [{
            'hostid': self._zapi_wrapper.get_host_by_host_name(_host)['hostid']
        } if str(_host) != '0' else {'hostid': '0'} for _host in operation.get('run_on_hosts')]
    def _construct_opcommand_grp(self, operation):
        """Construct operation command group.
        Args:
            operation: operation to construct command group
        Returns:
            list: constructed operation command group
        """
        if operation.get('run_on_groups') is None:
            return None
        return [{
            'groupid': self._zapi_wrapper.get_hostgroup_by_hostgroup_name(_group)['hostid']
        } for _group in operation.get('run_on_groups')]
    def _construct_opgroup(self, operation):