Merge pull request #344 from PeterStaev/feature/fix-bottom-nav-owner

feat(bottom-navigation): Add safety check for owner

Author: farfromrefug

src/bottom-navigation/index.ios.ts

@@ -51,7 +51,8 @@ class UITabBarControllerImpl extends UITabBarController {
     // @profile
     public viewDidDisappear(animated: boolean): void {
         super.viewDidDisappear(animated);
-        const owner = this._owner.get();
+
+        const owner = this._owner?.get();
         if (owner && !owner.parent && owner.isLoaded && !this.presentedViewController) {
             owner.callUnloaded();
         }