In the vast majority of cases, calling save() on a resource will

either include a caller-provided options object, or will get the

default value from being unspecified. The one case I've found where this

is not the case is Backbone.Collection.create(), which explicitly

calls save() on the object with a null options.
This change bullet-proofs that so we don't crash.

Saw that I could use code that called Collection.create without it

hitting an error.