When empty folders are sent to trash, they are not removed from the project list

[SusanRatiLane]

Describe the bug

When empty folders are selected on the project explorer and sent to trash, they still appear in the project list when the page is reloaded.

Affects

• Designer
• Blocks editor
• Projects Explorer
• Companion
• Compiled apps
• Buildserver
• Debugging
• Other... (please describe)

Expected behavior

Empty folders should be deleted. Currently, folders can't be restored from trash, though more sophisticated folder-trash handling could be a feature in the future.