DataTable: Colspan not working correctly when selectionMode='single' in Column

[YunKul-Lee]

Describe the bug

DataTable: Colspan not working correctly when selectionMode='single' in Column

When setting row selection with radio buttons in the DataTable, there is an issue where an extra colspan value is applied when the data is empty.

<DataTable> <Column selectionMode="single"> </DataTable>

It appears to be an issue with the columnsLength function in the BodyRow component.

Pull Request Link

No response

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

No response

Reproducer

https://stackblitz.com/edit/primevue-4-vite-datatable-issue?file=package.json

Environment

• Chrome : 133.0.6943.53
• PrimeVue : 4.2.5

Vue version

3.5.13

PrimeVue version

4.2.5

Node version

No response

Browser(s)

Chrome 133

Steps to reproduce the behavior

1. Go to https://stackblitz.com/edit/primevue-4-vite-datatable-issue?file=package.json
2. Open Chrome DevTools
3. Select 'No Data found.' rows
4. The table header has 5 columns, but the data section has colspan='6' applied.

Expected behavior

The colspan should be applied to match the number of columns in the table header.