timeframe is mandatory, no need to use .get()

freqtrade/exchange/exchange.py

@@ -137,7 +137,7 @@ class Exchange:
             self.validate_ordertypes(config.get('order_types', {}))
             self.validate_order_time_in_force(config.get('order_time_in_force', {}))
             self.validate_required_startup_candles(config.get('startup_candle_count', 0),
-                                                   config.get('timeframe'))
+                                                   config.get('timeframe', ''))
 
         # Converts the interval provided in minutes in config to seconds
         self.markets_refresh_interval: int = exchange_config.get(

tests/exchange/test_ccxt_compat.py

@@ -6,13 +6,12 @@ suitable to run with freqtrade.
 """
 
 from datetime import datetime, timedelta, timezone
-from freqtrade.exchange.exchange import timeframe_to_minutes
 from pathlib import Path
 
 import pytest
 
+from freqtrade.exchange import timeframe_to_minutes, timeframe_to_prev_date
 from freqtrade.resolvers.exchange_resolver import ExchangeResolver
-from freqtrade.exchange import timeframe_to_prev_date
 from tests.conftest import get_default_conf