fix(upgrade): allow for downgraded components to work with component-router #50871
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In the past, we had an implementation of the "Angular 2" router that also worked with AngularJS. Published as
@angular/router. We continued to expose that router implementation in G3 and some applications still use it. Now, when upgrading, they are seeing issues where the router throws because it cannot find a route config/ or$canActivateon the controller- simply because there is nocontrollerfunction for downgraded components.We can fix this and unblock the update by simply ensuring a controller function is defined.
Context: https://critique.corp.google.com/cl/539971007