gistfile1.js

dojo.safeWhen = function(value, callback, errback, progressHandler) {
  var deferred = value;
  if (!deferred || typeof deferred.then !== 'function') {
    deferred = new dojo.Deferred();
    setTimeout(function() { deferred.callback(value); }, 0);
  }
  return deferred.then(callback, errback, progressHandler);
};