Handle PreDB DNS errors

dailyreleases/predbs.py

@@ -1,7 +1,7 @@
 import logging
 from datetime import datetime
 from typing import NamedTuple, List
-from urllib.error import HTTPError
+from urllib.error import HTTPError, URLError
 
 from . import cache
 
@@ -25,7 +25,7 @@ def get_pres() -> List[Pre]:
             pres.update(
                 (p.dirname, p) for p in get()
             )  # override duplicate dirnames in later iterations
-        except HTTPError as e:
+        except (HTTPError, URLError) as e:
             logger.error(e)
             logger.warning("Connection to predb failed, skipping..")