app_server doesn't gracefully deal with missing accelerant
|Reported by:||anevilyak||Owned by:||axeld|
If a kernel driver for a graphics chip is present and publishes a device, but its corresponding accelerant is missing, the app_server fails to gracefully fall back to a different device. Noticed this by accident while disabling the radeon (removed the accelerant instead of the kernel driver like I usually do). End result, "Could not initialize graphics output, exiting" on serial, and the Desktop never appeared.