fix(core): avoid attempting to render media preview images when no value is set

[runeb]

Description

The current code attempts to construct an image URL for undefined. This results in a thrown (caught) exception which we can avoid by checking this value before attempting to render. This will happen per item in a document list that does not have a value to render for its media image. This change checks for a value before attempting to use it, which avoids the exception and overhead associated with that.

What to review

That there are no side-effects to avoiding this attempted render

Testing

Manual testing to verify that media preview images are rendering as expected.

Notes for release

Not required

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
studio-workshop	⬜️ Ignored (Inspect)			Aug 15, 2024 11:17pm

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Aug 15, 2024 11:28 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	43s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	8s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	30s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	36s	11	7	0
formBuilder/inputs/PortableText/copyPaste/CopyPasteFields.spec.tsx	✅ Passed (Inspect)	0s	0	12	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	17s	6	0	0
formBuilder/inputs/PortableText/DisableFocusAndUnset.spec.tsx	✅ Passed (Inspect)	10s	3	0	0
formBuilder/inputs/PortableText/DragAndDrop.spec.tsx	✅ Passed (Inspect)	3m 0s	0	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	43s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 46s	21	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 13s	18	0	0
formBuilder/inputs/PortableText/PresenceCursors.spec.tsx	✅ Passed (Inspect)	8s	3	9	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	25s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	17s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	❌ Failed (Inspect)	1m 23s	20	0	1
formBuilder/tree-editing/TreeEditing.spec.tsx	✅ Passed (Inspect)	1m 45s	30	0	0
formBuilder/tree-editing/TreeEditingNestedObjects.spec.tsx	✅ Passed (Inspect)	19s	3	0	0