Label container takes up space event when set to `false`

[jmariller]

Describe the bug
If I add a field and set the label as false (via new("name", false) or setLabel(false), a DOM element remains and takes up unnecessary space

To Reproduce
Steps are described above - the problem appears as of version 4.26.0

Looks currently like so:

Should like like this:

[fracsi]

Quick css fix:

.btn-label:empty {
    display: none;
}