fix: Using Escape to close Popover gets error "Cannot read properties of null (reading 'focusableElement')"

[Netius]

🐛 Bug Report

Pressing Escape to dismiss / close popover throws a error "Cannot read properties of null (reading 'focusableElement')".
I traced error to the file FluentAnchoredRegion.razor.js

Using Popover from demo also throws error - https://www.fluentui-blazor.net/Popover

💻 Repro or Code Sample

Go to demo https://www.fluentui-blazor.net/Popover
Press the button Open Callout 1 and press Escape on keyboard .
See error on the browser / console

🤔 Expected Behavior

Focus on the body or original button when dismissing / closing the popover

😯 Current Behavior

Pressing Escape closes the popover but throws error

💁 Possible Solution

I added in FluentAnchoredRegion.razor.js

export function goToNextFocusableElement(forContainer, toOriginal, delay) {

var container = typeof forContainer === "string" ? document.getElementById(forContainer) : forContainer;

**_if (container == null) container = document.querySelector("body");_**  MY CODE

🔦 Context

🌍 Your Environment

• OS & Device: [e.g. MacOS, iOS, Windows, Linux] on [iPhone 7, PC]
• Browser [e.g. Microsoft Edge, Google Chrome, Apple Safari, Mozilla FireFox]
• .NET and Fluent UI Blazor library Version [e.g. 8.0.2 and 4.4.1]

[dvoituron]

Will be fixed in next Release #3013