Removed "is not None"

https://stackoverflow.com/users/566644/lauritz-v-thaulow

freqtrade\configuration\configuration.py:461 reduced checks

freqtrade\persistence\trade_model.py:fee_updated - reduced code

freqtrade/plot/plotting.py

@@ -254,11 +254,11 @@ def plot_trades(fig, trades: pd.DataFrame) -> make_subplots:
     Add trades to "fig"
     """
     # Trades can be empty
-    if trades is not None and len(trades) > 0:
+    if trades and len(trades) > 0:
         # Create description for sell summarizing the trade
         trades['desc'] = trades.apply(
             lambda row: f"{row['profit_ratio']:.2%}, " +
-            (f"{row['enter_tag']}, " if row['enter_tag'] is not None else "") +
+            (f"{row['enter_tag']}, " if row['enter_tag'] else "") +
             f"{row['exit_reason']}, " +
             f"{row['trade_duration']} min",
             axis=1)