window: Hide rows with empty chat when folded

When a new chat is created, it is added to the chat list. If the user goes back to chat list without adding any chat message, hide the newly created chat as the user likely cancelled the chat.

Makes sense and works for me, let's have it

added 115 commits

• dd29c7cf...23aa35a4 - 114 commits from branch Librem5:master
• 77214599 - window: Hide rows with empty chat when folded

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enabled an automatic merge when the pipeline for 77214599 succeeds

merged