Steps to reproduce: 1. Leave or insert only one USB drive the system. 2. Press 'Open image file' button. 3. Choose iso file. 4. Close popup dialog(s). 5. Press 'Write' button. 6. Remove USB drive. 7. Press 'Clear Disk and Write Image' button. Expected result: Closing of popup confirmation window and displaying error message about that. Actual result: Program crashes.
For example - there may be case when user accidentally hooks up USB drive
Reported as bug 382990.