fix(cdk/portal): prevent calling ApplicationRef.detachView on destroyed instance
#24775
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This commit adds a check that ensures that the
ApplicationRef.detachViewis only called when there are some registered views in theApplicationRefinstance (thus the instance is not destroyed).Calling
ApplicationRefAPIs on destroyed instance will result in an error after angular/angular#45624. This commit makes the code forward-compatible with the upcoming changes. The error was discovered in g3 while running a TGP for angular/angular#45624.