It's not easy to read an error message when unlocking an encrypted device fails - for example when providing an incorrect passphrase. The message disappears too quickly.

Reproducible: Always

Steps to Reproduce:
1. Have a disk with an encrypted partition.
2. Start a new installation.
3. Select "Mount point assignment"
4. Let anaconda unlock the encrypted device, but provide an incorrect passphrase.
Actual Results:  
There is an error message displayed (as expected), but the dialog window is closed in a fraction of a second, so that the user actually doesn't have enough time to read the message.

Expected Results:  
There is enough time to read the message.