Summary:
When a JavaScript module is not registered as callable, the bridge will throw an error. Let's clean up the error message so that it's more helpful.
Now, it logs the number of registered callable JavaScript modules, as well as the list of callable JavaScript modules.
Changelog: [Internal]
Reviewed By: sshic
Differential Revision: D36646936
fbshipit-source-id: 62d091cda35e296ef9e569b444cd5b6f09b8bc54