[Webkit-unassigned] [Bug 209682] New: [Web Animations] Crash under `KeyframeEffect::getKeyframes` for a `DeclarativeAnimation`

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209682

            Bug ID: 209682
           Summary: [Web Animations] Crash under
                    `KeyframeEffect::getKeyframes` for a
                    `DeclarativeAnimation`
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: drousso at apple.com
                CC: dino at apple.com

# STEPS TO REPRODUCE:
1. inspect any page with a CSS animation/transition
2. select a node with an active CSS animation/transition in the Elements Tab
3. evaluate:

```
let effect = $0.getAnimations()[0].effect;
effect.getKeyframes(); // should not crash
effect.target = null;
effect.getKeyframes(); // will crash
```

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