📝 Provide detailed reproduction steps (if any)

1. Use link plugin with link_list, files_upload_handler and documents_file_types
2. Make link_list return an empty list
3. Click Insert/Edit link, "Upload" tab then try to upload a file

Here's a codepen with image plugin in comparison : https://codepen.io/webcompenc/pen/ByKXLrV
Try to upload a .png file through the link plugin.

✔️ Expected result

The link list should atleast have the "None" option when it is emptied (like it is done with the image plugin) and uploading a file shouldn't trigger an error.

❌ Actual result

This triggers an error :
<img width="490" height="348" alt="Image" src="https://github.com/user-attachments/assets/688e5a13-204e-4726-8ce8-8e4fd9af04e9" #/>

📃 Other details

• Browser: Chrome
• OS: Windows

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