Inconsistent results when extending parsed can.Models

[alexkrautmann]

I've noticed the following issues when extending a can.Model:

• When a parent Model defines can.Model.models, a child Model.findAll calls the success callback with a undefined list
• When a parent Model defines can.Model.parseModel, a child Model.findAll calls the success callback with a list of unparsed model objects
• When a parent Model defines can.Model.parseModels, a child Model.findAll calls the error callback with Error: Could not get any raw data while converting using .models

This seems similiar to #1246

Fiddle here.

[daffl]

It also looks like it is a regression. When I tested it, things worked in 2.1.3.

[alexkrautmann]

Hi daffl-

It might be important to note that all of these unexpected issues happen when findAll is defined in the parent models. This can be seen in the fiddle, but I didn't call it out in the original issue post.