Warnings when uninstall

It looks like we need to check if $third_party_settings['sections'] is set?

  // Loop through entity view displays, sections, and components.
  foreach ($view_displays as $display) {
    if (!$display instanceof LayoutBuilderEntityViewDisplay) {
      continue;
    }
    if ($display->isLayoutBuilderEnabled()) {
      $third_party_settings = $display->getThirdPartySettings('layout_builder');

      // Only track the entity type if overrides are enabled.
      if ($display->isOverridable()) {
        $lb_entity_types[] = $display->getTargetEntityTypeId();
      }

      foreach ($third_party_settings['sections'] as $section) { // <-- HERE
        $components = $section->getComponents();
        foreach ($components as $component) {
          // Remove 'component_attributes' from 'additional'.
          $additional = $component->get('additional');
          unset($additional['component_attributes']);
          $component->set('additional', $additional);
        }
      }
      $display
        ->setThirdPartySetting('layout_builder', 'sections', $third_party_settings['sections'])
        ->save();
    }
  }