Fix when a or b might be null (e.g. Async items) #28
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…roperty foo of null` error.
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Fixes
Cannot read property foo of nullerror. For example, below code might cause error:<ion-item-sliding *ngFor="let item of items | async | orderBy: 'isDone' : false; let i = index;"> <ion-item>{{item.text}}</ion-item> </ion-item-sliding>With fix proposed in pull request, no errors occur during application run.