[MatSelect] this.panel is undefined when changing option

[nicolainormann]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Open select and pick option without error

What is the current behavior?

Throws console error
Firefox: this.panel is undefined
Chrome: Cannot read property 'nativeElement' of undefined
Edge: Unable to get property 'nativeElement' of undefined or null reference

What are the steps to reproduce?

https://stackblitz.com/edit/angular-vyttwn
Open select > Pick option > See console for error

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 5.0.0
Material 2.0.0-beta.12

[crisbeto]

Will be fixed in the next release by #7729.

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