borderSkipped "middle" option does not work well with empty datasets

### Expected behavior

Bottom borders should have a radius when using `borderSkipped: "middle"` even if there's no dataset below (or the dataset is empty)

### Current behavior

Bottom border was drawn without radius

### Reproducible sample

https://codesandbox.io/s/eloquent-sammet-xix55o?file=/App.tsx

### Optional extra steps/info to reproduce

_No response_

### Possible solution

_No response_

### Context

_No response_

### chart.js version

v3.7.1

### Browser name and version

_No response_

### Link to your project

_No response_