Shared applications list not updated correctly in Qt UI Viewer when removing last project

Issue found:

If projects are removed from shared applications in Design Studio, Qt UI Viewer does not always update the projects correctly in projects dropdown.

Steps to reproduce:

1. Create two test projects Share1, Share2
2. Share both projects online, first Share1, then Share2
3. Open Qt UI Viewer
4. Check "Update user projects in the background" in Menu -> Settings
5. Go to Menu -> Home
6. -> Both projects are available when dropdown menu is opened, as expected
7. Select Share2
8. Remove Share2 from shared applications in DS
9. -> Qt UI viewer still shows removed project as selected project. When dropdown menu is opened, it shows correctly only Share1 and you can select it, but does not change the project name shown in combobox.
10. Remove Share1 from shared applications in DS
11. -> Qt UI Viewer still shows Share2 as selected project, opening menu shows Share1 project and running it will give "Critical: Please check your internet connection and try again" warning. 
12. -> Would expect that projects are removed, and "Scan QR code to access your projects" is shown
13. Closing and reopening Qt UI Viewer will clear the projects from the dropdown and show "Scan QR code to access your projects" as expected.