Check before calling unsubscribe in ngOnDestroy #35
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Karma testing a component that uses in it's template will cause the following error:
TypeError: Cannot read property 'unsubscribe' of undefined
at TagInputComponent.ngOnDestroy (webpack:///~/angular2-tag-input/dist/lib/components/tag-input/tag-input.component.js:207:0 <- src/test.ts:94090:34)
Therefore I think it would make sense to check before unsubscribing.