Warning Message for new webforms

Problem/Motivation

Warning message, "Notice: Trying to access array offset on value of type bool in Drupal\form_builder_webform\Form::addFirstPagebreak() (line 28 of /home/choral5/public_html/sites/all/modules/form_builder/modules/webform/src/Form.php)."

Steps to reproduce

Drupal core 7.92, php 7.4.32, create new webform, the above message appears.

Proposed resolution

The problem seems to be when the function addFirstPagebreak($node, $components) is called with empty $components. In that case, probably no action should be taken by that function anyway, so just add a test for empty($components) to the initial if statement:
if (array_key_exists('progressbar_label_first', $node->webform))
should be if (!empty($components) && array_key_exists('progressbar_label_first', $node->webform))

Remaining tasks

See if my modification is consistent with the code's logic.

User interface changes

API changes

Data model changes

None.