Make the GTFS-R client resilient to network errors.

gtfs_client.py

@@ -253,6 +253,7 @@ class GTFSClient():
 
     def __poll_gtfsr_deltas(self) -> list[map, set]:
 
+        try:
             # Poll GTFS-R API
             if self.gtfs_r_api_key != "":
                 headers = {"x-api-key": self.gtfs_r_api_key}
@@ -330,6 +331,9 @@ class GTFSClient():
                     raise(x)
                 
             return deltas, canceled_trips, added_stops
+        except Exception as e:
+            print("Polling for GTFS-R failed:", str(e))
+            return ({}, [], [])
 
 
     def get_next_n_buses(self, num_entries: int) -> pd.core.frame.DataFrame:
@@ -348,7 +352,6 @@ class GTFSClient():
         """
         Create and enqueue the refreshed stop data
         """
-        print("Refresh")
         # Retrieve the GTFS-R deltas
         deltas, canceled_trips, added_stops = self.__poll_gtfsr_deltas()
         if len(deltas) > 0 or len(canceled_trips) > 0 or len(added_stops) > 0: