[REG: 3.1 -> 3.2] Default asset folders are not created when adding assets with drag and drop

Steps to reproduce:

• Create a new project
• Open Assets view
• Add image/shader/sound/font asset by clicking + 
• Default import path is: project/content/images (sounds, shaders or fonts)
• When adding assets by dragging and dropping (to no specific folder) in assets view, these default folders are not created but import path defaults to project/content folder