fix(table-toolbar): fix console errors when slots are absent

[gavin-everett-genesys]

Note

The setActionIconOnlyProp() uses the spread operator to copy the array but the spread operator cannot accept null or undefined values which will return an error if the slot does not exist in the DOM. To alleviate this issue I just return an empty array.

✅ Closes: COMUI-3148

[github-actions]

Demo will be published at https://apps.inindca.com/common-ui-docs/genesys-webcomponents/feature/COMUI-3148

[jordanstith15]

would this possibly concat a null value making the array at least [null]? Is that caught by ???

[gavin-everett-genesys]

Updated to a more straightforward approach 👍

[jordanstith15]

So I should have described this more, but would making the same changes as get permanentActions in get contextualActions and get filterActions be better? That way it removes the null typing entirely and no changes are needed in get allFilterContextual.

Also could turn them into a tertiary depending on how you feel.
i.e.

get permanentActions(): HTMLGuxTableToolbarCustomActionElement[] {
    return this.permanentSlot?.hasChildNodes ?
        Array.from(
             this.permanentSlot?.querySelectorAll(
                 'gux-table-toolbar-action, gux-table-toolbar-custom-action'
             )
       )
       : [];
}

[gavin-everett-genesys]

Yeah this makes sense to me 👍