Fix read on undefined if animateOnDataChange is true

[FacuM]

The feature animateOnDataChange wants to know whether new data is available. However, while doing so, it attempts to read from an undefined object if there's, in fact, nothing new to read.

This patch fixes this bug by breaking out of the event listener if an undefined array element is found.

For an example, check the screenshot below:

Here's the call stack:

item.addListener$argument_0
   node_modules/gifted-charts-core/src/LineChart/index.ts:468:21
__callListeners
   node_modules/react-native-web/dist/vendor/react-native/Animated/nodes/AnimatedNode.js:119:9
__callListeners
   node_modules/react-native-web/dist/vendor/react-native/Animated/nodes/AnimatedWithChildren.js:63:7
__getNativeConfig
   node_modules/react-native-web/dist/vendor/react-native/Animated/nodes/AnimatedValue.js:260:3
animation.start$argument_2
   node_modules/react-native-web/dist/vendor/react-native/Animated/nodes/AnimatedValue.js:225:12
onUpdate
   node_modules/react-native-web/dist/vendor/react-native/Animated/animations/TimingAnimation.js:102:7

[Abhinandan-Kushwaha]

Thanks for this PR @FacuM