Fix for Error: [] operator not supported for strings in olivero_preprocess_form_element_label()

I attended your session during DrupalCamp Colorado last weekend and have been giving smart date module a try. It looks really good and I like the user friendly-ness. I did run into an issue with smart date module - recurring dates - when using Olivero [new D9 theme - also runs on D8 sites] theme. One of our team looked into it and we have a small patch:

Problem/Motivation

Error: [] operator not supported for strings in olivero_preprocess_form_element_label() (line 259 of /var/www/drupal/web/sites/default/themes/olivero/olivero.theme)

Steps to reproduce

root@94ecc520c552:/var/www/drupal# composer require 'drupal/smart_date:^2.8'

enable Smart Date and Smart Date Recurring
Create Content Type with a Smart Date Recurring field
Save

Try add /node/add
Produces -> Error (see above)

Proposed resolution

Patch -> attached();