TemplateRef shares context between instances when none is provided #10045

I'm submitting a ... (check one with "x")

[x] bug report
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior
angular/modules/@angular/core/src/linker/template_ref.ts currently uses a single object for EMPTY_CONTEXT. The problem is when ViewContainerRef #createEmbededView is called without providing a context object the shared one is used causing pollution between all instances utilizing the context.

Expected/desired behavior
Object sharing doesn't happen between instances relying on the context.

Maybe some solutions could be:

• TemplateRef_<C> instantiates a new object when none is provided
• ViewContainerRef #createEmbededView makes context mandatory and TemplateRef_<C> stops checking isBlank of context.

Reproduction of the problem
If the current behavior is a bug or you can illustrate your feature request better with an example, please provide the steps to reproduce and if possible a minimal demo of the problem via https://plnkr.co or similar (you can use this template as a starting point: http://plnkr.co/edit/tpl:AvJOMERrnz94ekVua0u5).

https://plnkr.co/edit/UhGsjLaHxiwI0n0nTYtN?p=preview
//TypeError: Cannot read property 'name' of undefined on second instance

Simplified Plunk: http://plnkr.co/edit/CQQembTFT0nOxGwCzSgc?p=preview
You can see the sharing of the context, test2 is listed twice in first block

What is the expected behavior?
No sharing of the context between instances

What is the motivation / use case for changing the behavior?
Errors

Please tell us about your environment:

• Angular version: 2.0.0-rc.4
• Browser: [all]
• Language: [TypeScript 1.8.10]