Quiet "Failed to find module" errors

[seanmonstar]

I have a couple modules in my app that are either included on the page from another part of the app, or only get conditionally included when in a nodejs environment.

I would like a way to pass in a few modules to be ignore, sort of like how NullModules currently will add that module as undefined. Except, I don't want them to be undefined, I just want dryice to not spit out "err: " during our build script.