Prevent the rendering of the tab bar tooltip if no caption is provided #13945
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What it does
Closes #13005.
How to test
Dock the settings widget and hover the icon.
Before:
![image](https://private-user-images.githubusercontent.com/13104167/351372874-cb27c948-eced-4303-99a4-1841763cfc1a.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MjU5NjMwMTIsIm5iZiI6MTcyNTk2MjcxMiwicGF0aCI6Ii8xMzEwNDE2Ny8zNTEzNzI4NzQtY2IyN2M5NDgtZWNlZC00MzAzLTk5YTQtMTg0MTc2M2NmYzFhLnBuZz9YLUFtei1BbGdvcml0aG09QVdTNC1ITUFDLVNIQTI1NiZYLUFtei1DcmVkZW50aWFsPUFLSUFWQ09EWUxTQTUzUFFLNFpBJTJGMjAyNDA5MTAlMkZ1cy1lYXN0LTElMkZzMyUyRmF3czRfcmVxdWVzdCZYLUFtei1EYXRlPTIwMjQwOTEwVDEwMDUxMlomWC1BbXotRXhwaXJlcz0zMDAmWC1BbXotU2lnbmF0dXJlPWMwN2RlZmZlZDVjYmM4MGUwYzNlNmVhYjRjYTYxYTgyZmIxNWUxNDg2MmRmZjMwYTBlMWY0NGRlZGM1N2YyMzQmWC1BbXotU2lnbmVkSGVhZGVycz1ob3N0JmFjdG9yX2lkPTAma2V5X2lkPTAmcmVwb19pZD0wIn0.WLcUbwzEUk7XbeTbKU7O3Bd23REudYGgodicGBoRVhU)
Fix:
![image](https://private-user-images.githubusercontent.com/13104167/351371601-e73bd909-6051-409d-9ad6-783da6fdd207.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.7JGsvC3UfAaBp5LAr15c5TjAn1OVsrgB-J0ItWLaUDM)
Follow-ups
Review checklist
Reminder for reviewers