fix error when missing timetablerow data

Author: sharhio

src/ui/TrainDataFetcher.tsx

@@ -165,11 +165,11 @@ const TrainDataFetcher: FC<IProps> = ({
               lineId: line,
               trainNumber: train.trainNumber,
               time: formattedDateTimeFromSeconds(
-                utcToSeconds(train.timeTableRows[idx].scheduledTime),
+                utcToSeconds(train.timeTableRows[idx]?.scheduledTime),
                 'yyyy-MM-dd HH:mm:ss',
               ),
-              timeInSecs: utcToSeconds(train.timeTableRows[idx].scheduledTime),
-              track: train.timeTableRows[idx].commercialTrack,
+              timeInSecs: utcToSeconds(train.timeTableRows[idx]?.scheduledTime),
+              track: train.timeTableRows[idx]?.commercialTrack,
             });
           }
         });