Dropdown does not correctly handle empty label strings

[sid-6581]

I'm submitting a ...

[x] bug report
[ ] feature request
[ ] support request

Current behavior

When a dropdown label is an empty string (""), the height of the dropdown control gets smaller. The height of the blank string option in the dropdown list is also less than the labels with non-blank strings.

Expected behavior

A label consisting of a blank string should have the same height as other strings.

• Vue version: 2 and 3 (latest versions)

• PrimeVue version: 2 and 3 (latest versions)

• Browser: [ Chrome (latest) ]