[Direct Transfer] New transfer from context menu does not work

This command will mimic a call from any context menu to start a new Direct Transfer:

$ python -m nxdrive 'nxdrive://direct-transfer/file:///media/tiger-222/Elements
QString::arg: Argument missing: "IGNORES_SYSTRAY" , 0
[1]    22223 segmentation fault  python -m nxdrive 

Here the segfault is thrown by the QML engine when the given file does not exist.

I guess this is due to the PyQt 5.15.0 upgrade. We need to fix it for the release.