##### 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"}
```
if diff_dict[k] == {}:
                del diff_dict[k]
            else:
                diff_dict[k] = v
        elif isinstance(v, list):
            diff_dict[k] = []
            compare_lists(v, d2[k], diff_dict[k])
            if diff_dict[k] == []:
                del diff_dict[k]
            else:
                diff_dict[k] = v
        else:
            if v != d2[k]:
                diff_dict[k] = v
    return diff_dict
def cleanup_data(obj):
    """Removes the None values from the object and returns the object
    Args:
        obj: object to cleanup
    Returns:
       object: cleaned object
    """
    if isinstance(obj, (list, tuple, set)):
        return type(obj)(cleanup_data(x) for x in obj if x is not None)
    elif isinstance(obj, dict):
        return type(obj)((cleanup_data(k), cleanup_data(v))
                         for k, v in obj.items() if k is not None and v is not None)
    else:
        return obj
def main():