remove unused import

freqtrade/tests/rpc/test_rpc.py

@@ -5,7 +5,7 @@ from datetime import datetime
 from unittest.mock import MagicMock, ANY
 
 import pytest
-from numpy import NAN, isnan
+from numpy import isnan
 
 from freqtrade import TemporaryError, DependencyException
 from freqtrade.fiat_convert import CryptoToFiatConverter
@@ -253,6 +253,7 @@ def test_rpc_trade_statistics(default_conf, ticker, ticker_sell_up, fee,
     assert prec_satoshi(stats['best_rate'], 6.2)
     assert isnan(stats['profit_all_coin'])
 
+
 # Test that rpc_trade_statistics can handle trades that lacks
 # trade.open_rate (it is set to None)
 def test_rpc_trade_statistics_closed(mocker, default_conf, ticker, fee, markets,