##### 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"}
```
"""
    Compares l1 and l2 lists and adds the items that are different
    to the diff_dict dictionary.
    Used in recursion with compare_dictionaries() function.
    Args:
        l1: first list to compare
        l2: second list to compare
        diff_dict: dictionary to store the difference
    Returns:
        dict: items that are different
    """
    if len(l1) != len(l2):
        diff_dict.append(l1)
        return diff_dict
    for i, item in enumerate(l1):
        if isinstance(item, dict):
            diff_dict.insert(i, {})
            diff_dict[i] = compare_dictionaries(item, l2[i], diff_dict[i])
        else:
            if item != l2[i]:
                diff_dict.append(item)
    while {} in diff_dict:
        diff_dict.remove({})
    return diff_dict
def compare_dictionaries(d1, d2, diff_dict):