Joey Perrott 763023472b fix(router): prevent calling unsubscribe on undefined subscription in RouterPreloader (#38344)
Previously, the `ngOnDestroy` method called `unsubscribe` regardless of if `subscription` had
been initialized.  This can lead to an error attempting to call `unsubscribe` of undefined.
This change prevents this error, and instead only attempts `unsubscribe` when the subscription
has been defined.

PR Close #38344
2020-08-05 10:54:41 -07:00
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