this.model is null in collection view's initialize method

[liorcode]

This commit: 4dc07ff introduced a new bug: this.model is null in a collection view's initialize method.

I believe this is because options[type] is nullified: it works fine for views, as their constructor calls obj.ctor which calls setModel, but collection view doesn't have a constructor - so it doesn't call setModel (at least not before initialize), and therefore this.model is null (this._model is defined of course..)