How to reproduce:

• Select an own secret key (stored on harddisk) that's protected with a password
• Start a "Print secret key" operation
• When asked for the password simply press Return to enter an empty password; repeat for all password prompts

-> An error message with error "No passphrase given" is shown
This is OK / as expected.

• Quit the application; click "Quit Kleopatra" in the confirmation dialog

-> A warning dialog is shown with text

There are still some background operations ongoing. These will be terminated when closing the window. Proceed?

This is NOT OK.