Click run button before a program is loaded results in weird output

[sorawee]

When I load a file I created, if I click run button before it finishes loading, in CPO I got

An unexpected error occurred: [object Object]

in patch-experiment.herokuapp.com, however, I got "Ahoy, world!" instead

[schanzer]

Confirmed fixed.

[jpolitz]

(Bad reference, meant to reference brownplt/code.pyret.org#484)