Passing a non-breaking space as an attribute name raises a runtime error

[magopian]

Disclaimer: I believe the bug is in the compiler (see elm/html#46 and elm/html#47).

As it's likely not going to be fixed (for performance reasons), I guess it makes sense to fix it in this library.

To reproduce, try parsing and rendering something like <img \u{00a0} /> (example in this Ellie), and there will be a runtime error in the console: InvalidCharacterError: String contains an invalid character.

At least in some cases, this results in an infinite loop of rendering/runtime errors, which brings the browser (and the whole computer) to its knees.

[hecrj]

I see! Thanks for the detailed report and the fix! 🎉 🎉