be graceful if users/tracks dirs not found

This may happen on a fresh instance, when you navigate to the admin
view.

1 files changed, 8 insertions, 2 deletions

diff --git a/fietsboek/data.py b/fietsboek/data.py
index d4292d6..3fcd922 100644
--- a/fietsboek/data.py
+++ b/fietsboek/data.py
@@ -139,14 +139,20 @@ class DataManager:
 
         :return: A list of all track IDs.
         """
-        return [int(track.name) for track in self._track_data_dir(".").iterdir()]
+        try:
+            return [int(track.name) for track in self._track_data_dir(".").iterdir()]
+        except FileNotFoundError:
+            return []
 
     def list_users(self) -> list[int]:
         """Returns a list of all users.
 
         :return: A list of all user IDs.
         """
-        return [int(user.name) for user in self._user_data_dir(".").iterdir()]
+        try:
+            return [int(user.name) for user in self._user_data_dir(".").iterdir()]
+        except FileNotFoundError:
+            return []
 
 
 class TrackDataDir: