The original fix didn't account for the fact that in IE <object> elements
with no data attribute have an object contentDocument. The fix leverages
the fact that this special object has a null prototype.

Closes jquerygh-4390
Ref jquerygh-4384
Ref jquerygh-4385

Summary

Checklist

• All authors have signed the CLA at https://cla.js.foundation/jquery/jquery
• New tests have been added to show the fix or feature works
• Grunt build and unit tests pass locally with these changes
• If needed, a docs issue/PR was created at https://github.com/jquery/api.jquery.com