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/data/btanalysis.py

@@ -224,7 +224,7 @@ def find_existing_backtest_stats(dirname: Union[Path, str], run_ids: Dict[str, s
                 # This strategy is not present in analyzed backtest.
                 continue
 
-            if min_backtest_date is not None:
+            if min_backtest_date:
                 backtest_date = strategy_metadata['backtest_start_time']
                 backtest_date = datetime.fromtimestamp(backtest_date, tz=timezone.utc)
                 if backtest_date < min_backtest_date:

freqtrade/data/dataprovider.py

@@ -141,7 +141,7 @@ class DataProvider:
                 df, date = self.__cached_pairs[pair_key]
             else:
                 df, date = self.__cached_pairs[pair_key]
-                if self.__slice_index is not None:
+                if self.__slice_index:
                     max_index = self.__slice_index
                     df = df.iloc[max(0, max_index - MAX_DATAFRAME_CANDLES):max_index]
             return df, date