don't let specific node failures fail us

tailscalesd/main.py

@@ -94,6 +94,8 @@ async def matrix_node_sd(device) -> Dict:
 
 
 def matrix_workers_to_sd(device, workers) -> List:
+    if len(workers) == 0:
+        return []
     ipv4 = filter_ipv6(device["addresses"])[0]
     target_groups = []
     for worker_type, workers in workers.items():
@@ -125,7 +127,12 @@ async def matrix_sd(devices) -> List:
     for device in devices:
         if "tag:matrix" not in device["tags"]:
             continue
+        try:
             workers = await matrix_node_sd(device)
+        except Exception as e:
+            log.error(f"Failed parsing matrix node sd for device={device['hostname']}")
+            log.error(e)
+            workers = []
         targets = matrix_workers_to_sd(device, workers)
         if targets:
             sd.append(targets)