fix: fix error for interfaces without ip addresses (#200)

prometheuspvesd/discovery.py

@@ -68,7 +68,7 @@ class Discovery():
 
             if type(networks) is list:
                 for network in networks:
-                    for ip_address in network["ip-addresses"]:
+                    for ip_address in network.get("ip-addresses", []):
                         if ip_address["ip-address-type"] == "ipv4" and not ipv4_address:
                             ipv4_address = self._validate_ip(ip_address["ip-address"])
                         elif ip_address["ip-address-type"] == "ipv6" and not ipv6_address:

prometheuspvesd/test/fixtures/fixtures.py

@@ -350,6 +350,10 @@ def networks():
                 "tx-packets": 14423878
             }
         },
+        {
+            "hardware-address": "ba:97:85:bd:9a:a5",
+            "name": "eth1"
+        },
     ]