createList passes null params to utils.merge

[twalling]

The createList method optionally takes a 3rd params object but checks to see if it is actually a callback function. If it is a callback function then params is set null. Later on, this null params value is passed to utils.merge and results in an error.

[AvianFlu]

utils.merge needs to go. I'll be replacing it when I get the time - hopefully later this week.