Broken link in description after the attachment is deleted

[cloud2018]

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Describe the bug In the description of a card the link of an inserted attachment is broken, after the attachment is deleted

To Reproduce

1. Attach a file to a card
2. Insert the attachment (test_attachment.txt) into description
3. Delete the attachment
4. Wait until the attachment is finally deleted and the icon for undelete is disappeared
5. Open the card and click on the link "???? test_attachment.txt", which refers to (/nextcloud/apps/deck/cards/188/attachment/42)
6. The nextcloud errorpage "Internal Server Error; The server was unable to complete your request.; If this happens again, ..." is displayed

Expected behavior In the description is only the text "???? test_attachment.txt" or "???? missing attachment: test_attachment.txt" and no clickable link, which refers to the deleted file

Tested with 0.4.0-beta3

Note Perhaps the behavior depends on the extension of the deleted file. With textfiles there is a broken link, with images it is just like expected "???? test_attachment.jpg" (without link)

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