🐛 Fix invalid line id returned by /stop/{stop_id}/nextPassages endpoint

backend/main.py

@@ -199,11 +199,12 @@ async def get_next_passages(stop_id: int) -> NextPassagesSchema | None:
 
             # re.match will return None if the given journey.LineRef.value is not valid.
             try:
-                line_id = IdfmInterface.LINE_RE.match(journey.LineRef.value).group(1)
-            except AttributeError as exc:
+                line_id_match = IdfmInterface.LINE_RE.match(journey.LineRef.value)
+                line_id = int(line_id_match.group(1))  # type: ignore
+            except (AttributeError, TypeError, ValueError) as err:
                 raise HTTPException(
                     status_code=404, detail=f'Line "{journey.LineRef.value}" not found'
-                ) from exc
+                ) from err
 
             call = journey.MonitoredCall