Facebook Widget: ErrorUtils error in console

### Impacted plugin

Jetpack

### Steps to Reproduce

**This error doesn't seem to affect the functionality of the widget.**

1. Install, activate, and connect Jetpack.
2. In wp-admin, navigate to Jetpack -> Settings -> Writing.
3. Enable the "Make extra widgets available for use on your site including subscription forms and Twitter streams" setting. It's in the `Widgets` section.
4. In wp-admin, navigate to Appearance -> Widgets.
5. Add a new "Facebook Page Plugin (Jetpack)" widget. Enable the widget's "Show Timeline" setting.
6. Click the `Update` button to save the widget.
7. Check the dev tools console, and see this error:
```
ErrorUtils caught an error:

Cannot listen to an undefined element. [Caught in: Tried to listen to element of type click]

Subsequent non-fatal errors won't be logged; see https://fburl.com/debugjs.
```

A similar (possibly same) error was reported to Facebook [here](https://developers.facebook.com/community/threads/226101445658989/).

Reproduce the issue with Jetpack enabled in wp-admin under Appearance → Widgets, add the Facebook Page Plugin widget with Show Timeline enabled, and inspect the browser console. Trace the Facebook widget integration from that entry point; done means the widget remains functional and the reported ErrorUtils message is no longer logged.

Written by the indexing model from the issue text.