More error-proofing

filter_subdomains.py

@@ -37,6 +37,9 @@ def is_subdomain_matching(subdomain: str) -> bool:
     except dns.exception.Timeout:
         print(f"Timeout for {subdomain}", file=sys.stderr)
         return False
+    except dns.name.EmptyLabel:
+        print(f"Empty label for {subdomain}", file=sys.stderr)
+        return False
     canonical = query.canonical_name.to_text()
     for regex in regexes.REGEXES:
         if re.match(regex, canonical):