Update ruff pre-commit hook

Author: NMertsch

.pre-commit-config.yaml

@@ -9,9 +9,9 @@ repos:
       - id: check-added-large-files
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.14.7
+    rev: v0.15.4
     hooks:
-      - id: ruff
+      - id: ruff-check
         # fix imports:
         # - I001: Bad import order or format
         # - F401: Unused import

src/europython_discord/program_notifications/session_to_embed.py

@@ -109,7 +109,7 @@ def _format_room(rooms: list[str]) -> str:
     :return: The name of a room or a placeholder value.
     """
     room = ", ".join(rooms)
-    return room if room else _FIELD_VALUE_EMPTY
+    return room or _FIELD_VALUE_EMPTY
 
 
 def _format_track(track: str | None) -> str: