fix last typechecks

freqtrade/arguments.py

@@ -211,7 +211,8 @@ class Arguments(object):
         self.hyperopt_options(hyperopt_cmd)
 
     @staticmethod
-    def parse_timerange(text: str) -> Optional[Tuple[Tuple, Optional[int], Optional[int]]]:
+    def parse_timerange(text: Optional[str]) -> Optional[Tuple[Tuple,
+                                                         Optional[int], Optional[int]]]:
         """
         Parse the value of the argument --timerange to determine what is the range desired
         :param text: value from --timerange

freqtrade/optimize/backtesting.py

@@ -219,7 +219,7 @@ class Backtesting(object):
             logger.info('Using local backtesting data (using whitelist in given config) ...')
 
             timerange = Arguments.parse_timerange(str(self.config.get('timerange')))
-            data = optimize.load_data(
+            data = optimize.load_data(  # type: ignore
                 self.config['datadir'],
                 pairs=pairs,
                 ticker_interval=self.ticker_interval,

freqtrade/optimize/hyperopt.py

@@ -494,9 +494,9 @@ class Hyperopt(Backtesting):
                 )
 
     def start(self) -> None:
-        timerange = Arguments.parse_timerange(self.config.get('timerange') if self.config.get(
+        timerange = Arguments.parse_timerange(None if self.config.get(
             'timerange') is None else str(self.config.get('timerange')))
-        data = load_data(
+        data = load_data(  # type: ignore
             datadir=str(self.config.get('datadir')),
             pairs=self.config['exchange']['pair_whitelist'],
             ticker_interval=self.ticker_interval,