[Observium] Subifs no longer showing up for Cisco ASR9K/IOS-XR device after upgrade

Hi all,

I've been using Observium since January, and I've mostly been happy with it. I upgraded to 0.13.4.3934 yesterday, and since then, none of the sub-interfaces on a ASR9K/IOS-XR 4.3.0 router are being collected. Originally I thought it was due to an upgrade error on my part, so I deleted the host and re-added it, but the sub-interfaces are not being seen and data not being collected. Let me know what information is needed, and I'll present it.

-- Stephen