When I try to install the system on an encrypted RAID-1 partition, the installation fails.

Reproducible: Always

Steps to Reproduce:
1. Run Anaconda Web UI
2. Click Modify storage
3. Create encrypted RAID device
4. Exit blivet-gui
5. Click Rescan 
6. Select disks
7. Check Mount point assignment
8. Click Next
9. Configure necessary mount points
10. Click Next
11. Warning appears: The existing unlocked LUKS device localhost-live:raid-luks cannot be used for the installation without an encryption key specified for this device. Please, rescan the storage.
12. Click Back
13. Repeat steps 5 to 8
14. The encrypted RAID device disappears from the drop-down list and the warning message from step 11 reappears

Optional steps:

15. Exit Anaconda Web UI, reboot and run Anaconda Web UI again
16. Repeat steps 6 to 8
17. Message appears: Encrypted devices are locked. Devices should be unlocked before assigning mount points.
18. Unlock device
19. Repeat steps 9 and 10
20. Click Apply mount point assignment and install
Actual Results:  
Critical Error
The installer cannot continue due to a critical error: Installation of the system failed: Инсталиране на софтуер 0%

Expected Results:  
Anaconda completes successfully

Installer WebUI Critical Error:
Installation of the system failed: Инсталиране на софтуер 0% org.fedoraproject.Anaconda.PayloadInstallationError: Failed to install image: rsync exited with code 11

## Hardware Information:
- **Hardware Model:**                              ASRock H97 Pro4
- **Memory:**                                      32.0 GiB
- **Processor:**                                   Intel® Core™ i7-4790 × 8
- **Graphics:**                                    Intel® HD Graphics 4600 (HSW GT2)
- **Disks Capacity:**                              2 SSDs + 2 HDDs