chore: ignore ws shutdown network errors

freqtrade/exchange/exchange_ws.py

@@ -148,6 +148,10 @@ class ExchangeWS:
         except ccxt.NotSupported as e:
             logger.debug("un_watch_ohlcv_for_symbols not supported: %s", e)
             pass
+        except ccxt.NetworkError as e:
+            # Network errors are common on shutdown so we can ignore them.
+            # It's a network error - which most likely means that the connection is already closed.
+            logger.debug("Network error during unwatch for %s, %s: %s", pair, timeframe, e)
         except Exception:
             logger.exception(f"Exception in _unwatch_ohlcv for {pair}, {timeframe},")