Call to a member function get() on null in Drupal\ai_ckeditor\AiCKEditorPluginBase->buildCkEditorModalForm()
## Summary
When I try to use any AI CKEditor action, I get the following fatal error:
`Error: Call to a member function get() on null in Drupal\ai_ckeditor\AiCKEditorPluginBase->buildCkEditorModalForm() (line 214 of /var/www/html/web/modules/contrib/ai/modules/ai_ckeditor/src/AiCKEditorPluginBase.php).`
It happens when I use CKEditor inside Canvas.
## Steps to reproduce
1. Install https://www.drupal.org/project/canvas
2. Enable the ai_ckeditor submodule and configure an AI provider.
3. Install https://www.drupal.org/project/canvas_full_html to be able to use CKEditor AI features inside Canvas components.
4. Enable the "AI Assistant" button on a CKEditor full HTML text format used by a Canvas field.
5. In the Canvas editor, edit a component with a CKEditor field.
6. Click AI Assistant → Generate with AI (or any AI action).
<!-- /label ~"aiSearch" -->
<!-- /label ~"aiTest" -->
<!-- /label ~"aiTranslate" -->
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