Suggested Fix: [Image + Teaser] Don't require ALT text if no asset selected #2523

[ConnorJamesLow]

Q	A
Fixed Issues?	Fixes #2523
Patch: Bug Fix?	✅
Minor: New Feature?
Major: Breaking Change?
Tests Added + Pass?	N/A
Documentation Provided	✅ Yes (code comments)
Any Dependency Changes?	No
License	Apache License, Version 2.0

Fix the image dialog validation logic per #2523.

• Checking "Don't provide an alternative text" should prevent an error message from showing under alt when done editing.
• Checking "Inherit from description of asset" should also prevent an error message.

[sonarcloud[bot]]

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