Prevent transfer to MCU unless MCU name field is filled in

[hwiguna]

When the MCU Name textbox is blank and you click Transfer, the app freezes on "Saving files". One of the ways MCU name would be blank is if you control-click the selected file on the left file list.
The only I have been able to recover from this is to end-task via Task Manager (Windows).

[BetaRavener]

Thanks for report, I'll reproduce and fix this in next few days.