User-Agent:       Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/42.0.2311.135 Safari/537.36
Build Identifier: 

when change HDDs 
Yast2 Bootloader Module use file /etc/default/grub_installdevice. This has an
entry with an not exist device (Example: The old device path from an replaced
hdd) 
when updating distro to 13.2 when device name changing

Reproducible: Always

Steps to Reproduce:
1. Change hdd device or make a fake entry in /etc/default/grub_installdevice

Actual Results:  
1. start yast2 bootloader module
2. the module show an error message "Unknown Device in udev list ... by
function to_kernel_devices. device_mapping.rb:42" 

Expected Results:  
1. Yast2 bootloader module should start normaly
2. The file /etc/default/grub_installdevice should be removed or updated

it is not the same bug as 902385!