function executeCallbacks(args, depsNotFound) {
  // accept function as argument
  if (args.call) args = {success: args};

  // success and error callbacks
  if (depsNotFound.length) (args.error || devnull)(depsNotFound);
  else (args.success || devnull)(args);
}
Execute callbacks.
@param {Object or Function} args - The callback args
@param {string[]} depsNotFound - List of dependencies not found