Remove anonymous fragment for now.

[ianjosephwilson]

• Remove anonymous fragments from the parser for now: ie. <></>.

[pauleveritt]

That's cool that you detect it and raise NotImplemented. You removed all mention from the README, I believe. Should we have a quick callout saying "some of you might be looking for....but not needed"?

[ianjosephwilson]

Well it doesn't really detect per se I just wasn't sure what the best way to handle the type checking without drowning in trying to splice that class out of the union type. We are still using implicit fragments to wrap each t-string so we need some of that code in there. I think we'll need to work on the messaging around that and maybe put it in the fragment issue.