bug: slick slider rendering slide item for Null values !

Recently I'm using slick slider I noticed that if I return `null` from a component the slider is still showing slide item for the null value. let me share an example let's say i have 4 items in a list I'm returning `null` for the first 2 items so slider should show only 2 items since null is not a valid value/component but it's showing 4 items with 2 empty slides ! is this expected behaviour in slick slider ?

### slick slider implementation
[Slick Slider Demo](https://codesandbox.io/p/sandbox/beautiful-voice-ykstt8?file=%2Fsrc%2FApp.tsx%3A132%2C53)

I also tried the same example using Owl carousel which is showing expected results.
### owl carousel implementation
[Own Carousel Demo](https://codesandbox.io/p/sandbox/nervous-pare-f6prvx)