module Sprockets::Resolve

def resolve!(path, options = {})

nil if no assets are found.
Public: Same as resolve() but raises a FileNotFound exception instead of 
def resolve!(path, options = {})
  uri, deps = resolve(path, options.merge(compat: false))
  unless uri
    message = "couldn't find file '#{path}'"
    if relative_path?(path) && options[:base_path]
      load_path, _ = paths_split(config[:paths], options[:base_path])
      message << " under '#{load_path}'"
    end
    message << " with type '#{options[:accept]}'" if options[:accept]
    raise FileNotFound, message
  end
  return uri, deps
end