Errors not being propagated upwards into editor

[StoneCypher]

The reason #531 required Christopher to reach out to me is that the engine was saying Uncaught Error: already has "a" to "b", but the editor wasn't catching it

As a result, Christopher couldn't tell what was actually wrong

Fix this

[blackeuler]

Hmm I wasn't sure if not propagating the error was a design choice, users shouldn't be concerned with Console Errors. This did make it at least seem like on the surface an intended feature instead of a crash.

[StoneCypher]

it's not a console error. the machine is throwing because the code is wrong (by design)

the editor absolutely should be picking it up

[StoneCypher]

Re-check this while you're at it

#343