Provide better error response when template parsing fails

[ThaNarie]

Currently, when you mess up something in your HTML, you could get an error similar to this:

TypeError: (intermediate value)(intermediate value).push is not a function

In this case, it was caused by a missing > in the opening <div;

html`<div
  <span data-foo="${'test'}">test</span>
</div>`,

The error you get, is not very helpful.

This is a known issue (developit/htm#188), but there isn't a solution yet – either a better error response, or auto-fix that error.

For now, we could wrap our html export that adds a try/catch and tries to do at least some error reporting.