Tried that, but not without hacking something else. `assignTemplate` will check for the attribute being a function. Can't check against `Handlebars.VM.noop` in `assignTemplate` either (as in, if it's noop, look in templates hash based on name) as that's something that we want to be allowed to be assigned.

FYI inclusion of this (or similar functionality) should have happened before. It was intended in the design but there were just no tests actually testing it.