DRM-Enumerator: Raise exception after checked all devices

[laley169]

DRM-Enumerator: Raise "failed to get resources" exception only after checked all devices

Issue: On a raspberry I have card0 and card1 in /dev/dri. The problem is that the enumerator fails to get the resources from card0 and raises an exception, thus it never checks card1 which supplies the correct resources.

This commit is meant to fix this issue.