Move config json validation to after strategy loading

Otherwise attributes are mandatory in configuration
while they could be set in the strategy

freqtrade/optimize/edge_cli.py

@@ -9,7 +9,8 @@ from typing import Any, Dict
 from tabulate import tabulate
 
 from freqtrade import constants
-from freqtrade.configuration import TimeRange, remove_credentials
+from freqtrade.configuration import (TimeRange, remove_credentials,
+                                     validate_config_consistency)
 from freqtrade.edge import Edge
 from freqtrade.exchange import Exchange
 from freqtrade.resolvers import StrategyResolver
@@ -35,6 +36,8 @@ class EdgeCli:
         self.exchange = Exchange(self.config)
         self.strategy = StrategyResolver(self.config).strategy
 
+        validate_config_consistency(self.config)
+
         self.edge = Edge(config, self.exchange, self.strategy)
         # Set refresh_pairs to false for edge-cli (it must be true for edge)
         self.edge._refresh_pairs = False