Stop Perseus from throwing TypeErrors when typing in fake widget types.
Stop Perseus from throwing TypeErrors when typing in fake widget types.

Test Plan:
Verified that changing [[(snowman) plotter 1]] to [[(snowman) orderer 1]] by
typing no longer throws an error on test.html

Auditors: jack

alexristich/perseus,junyiacademy/perseus,ariabuckles/perseus,huangins/perseus,daukantas/perseus,chirilo/perseus,daukantas/perseus,ariabuckles/perseus,learningequality/perseus,iamchenxin/perseus,huangins/perseus,sachgits/perseus,iamchenxin/perseus,ariabuckles/perseus,ariabuckles/perseus,abe4mvp/perseus,sachgits/perseus,junyiacademy/perseus,abe4mvp/perseus,chirilo/perseus,learningequality/perseus,alexristich/perseus