### Summary

If a module calls `fail_json()` and provides `exception=None`, this will crash every callback that uses `_handle_exception` from `CallbackBase`: if verbosity is < 3, it will try to call `split` on `None`, and otherwise it will try to concatenate a string with `None` (which results in `TypeError`).

### Issue Type

Bug Report

### Component Name

lib/ansible/plugins/callback/__init__.py

### Ansible Version

```console
devel
```


### Configuration

```console
*
```


### OS / Environment

*

### Steps to Reproduce

*

### Expected Results

*

### Actual Results

```console
*
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
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    def runner_on_skipped(self, host, item=None):
        pass
    def runner_on_unreachable(self, host, res):
        pass
    def runner_on_no_hosts(self):
        pass
    def runner_on_async_poll(self, host, res, jid, clock):
        pass
    def runner_on_async_ok(self, host, res, jid):
        pass
    def runner_on_async_failed(self, host, res, jid):
        pass
    def playbook_on_start(self):
        pass
    def playbook_on_notify(self, host, handler):
        pass
    def playbook_on_no_hosts_matched(self):
        pass
    def playbook_on_no_hosts_remaining(self):
        pass
    def playbook_on_task_start(self, name, is_conditional):
        pass
    def playbook_on_vars_prompt(self, varname, private=True, prompt=None, encrypt=None, confirm=False, salt_size=None, salt=None, default=None, unsafe=None):
        pass
    def playbook_on_setup(self):
        pass
    def playbook_on_import_for_host(self, host, imported_file):
        pass
    def playbook_on_not_import_for_host(self, host, missing_file):