Instantiate abstract component is possible

[wKoza]

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[ ] feature request
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Current behavior
When I create an abstract component class, it's possible to 'instantiate' it

semantically, it isn't normal to be able to instantiate an abstract class.

Expected behavior
we cannot create an instance of an abstract class / Component

Minimal reproduction of the problem with instructions

see plunkr : https://plnkr.co/edit/A7Ja9FS4WlGYJ6tHM8HY?p=preview

• Angular version: 2.3.X

• Language: [TypeScript X.X]

[pkozlowski-opensource]

This is fixed in Angular v9 running ivy where it is no longer possible to add an abstract component to NgModule: https://ng-run.com/edit/r1B61BrxTc6gXcTvk7KK

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