fix: don't fail when upstream DNS returns no AAAA records

workaround for silly recursors

nyacme/hook.py

@@ -82,7 +82,13 @@ def resolve4(addr: str) -> list[str]:
     return list(map(str, res))
 
 def resolve6(addr: str) -> list[str]:
-    res = dns.resolver.resolve(addr, 'AAAA')
+    try:
+        res = dns.resolver.resolve(addr, 'AAAA')
+    except dns.resolver.NoAnswer:
+        # workaround for silly recursors that return NOERROR
+        # empty response when they don't support IPv6
+        log.warning('no IPv6 nameservers returned')
+        res = []
     return list(map(str, res))