Failing test for omitted closing tags.

Some elements do not need a closing tag. Both `<p>` and `<li>` fall into
this category.

* https://html.spec.whatwg.org/multipage/semantics.html#the-p-element
* https://html.spec.whatwg.org/multipage/semantics.html#the-li-element

```
Error: Closing tag ul did not match last open tag li
    at HTMLProcessor.tokenHandlers.EndTag (http://localhost:6200/amd/htmlbars-compiler.amd.js:2766:17)
    at HTMLProcessor.acceptToken (http://localhost:6200/amd/htmlbars-compiler.amd.js:2903:47)

Error: Closing tag div did not match last open tag p
    at HTMLProcessor.tokenHandlers.EndTag (http://localhost:6200/amd/htmlbars-compiler.amd.js:2766:17)
    at HTMLProcessor.acceptToken (http://localhost:6200/amd/htmlbars-compiler.amd.js:2903:47)
```