Fix video element, DEV-1536

[iranimij]

Note

Ensures the slide widget mixin safely handles slides without a video background while preserving Cookiebot-based blocking for supported platforms.

• Adds an early return when no videoElement is found, invoking originalWidget to avoid running video/consent logic
• Adjusts guard to only check blockVideoConsentConfig and isSupportedVideoPlatform(src) (removes !videoElement from the combined condition)
• Affects view/frontend/web/js/slide-widget-mixin.js behavior for video backgrounds and consent blocking

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