Error when deleting object shown by search

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Description of the bug

When a GameObject that is visible in the hierarchy is destroyed while in search mode, a NullReferenceException is thrown.

Reproduction steps

1. Type something in the search bar, so that at least one entry is displayed in the hierarchy
2. Delete one of the displayed GameObjects from Unity's hierarchy (or by any other means)

Platform specs

• Unity version: 2020.3.19f1
• Platform: Windows
• How did you download the plugin: Package Manager (GitHub)

Additional info

NullReferenceException is thrown here

https://github.com/yasirkula/UnityRuntimeInspector/blob/d1e02a3f5d92ebb928069a6d6852c7daaea3079f/Plugins/RuntimeInspector/Scripts/RuntimeHierarchy/HierarchyDataRootScene.cs#L31