test_urls: Ensure status is set despite exceptions

scripts/test_urls.py

@@ -74,6 +74,7 @@ broken = 0
 for url in urls:
     print("%s : " %(url), end='')
     sys.stdout.flush()
+    status = None
     try:
         resp = requests.head(url, headers=headers, allow_redirects=True, timeout=60, verify=False)
         status = resp.ok