fix: Adding null check before calling Update on Bindings

[nickrandolph]

GitHub Issue (If applicable): #1534

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

Null reference on WinUI in certain cases when calling Update when Bindings is null

What is the new behavior?

Null check prevents calling Update when Bindings is null

PR Checklist

Please check if your PR fulfills the following requirements:

• [ X ] Tested code with current supported SDKs
• [ N/A ] Docs have been added/updated which fit documentation template. (for bug fixes / features)
• [ N/A ] Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• [ X ] Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• [ X ] Contains NO breaking changes
• [ N/A ] Updated the Release Notes
• [ X ] Associated with an issue (GitHub or internal)

[nickrandolph]

https://github.com/Mergifyio backport release/stable/2.4

GitHub

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[mergify]

backport release/stable/2.4

✅ Backports have been created

• #1536 fix: Adding null check before calling Update on Bindings (backport #1535) has been created for branch release/stable/2.4