use pairlist_pos remove unused check, fixed Test

freqtrade/plugins/pairlist/RemotePairList.py

@@ -63,14 +63,7 @@ class RemotePairList(IPairList):
                 '`processing_mode` not configured correctly. Supported Modes '
                 'are "filter","append"')
 
-        pairlists = self._config['pairlists']
-
-        if len(pairlists) == 1 and self._mode == 'blacklist':
-            raise OperationalException(
-                'At `blacklist` mode RemotePairList requires an additional '
-                'Pairlist and cannot be used on its own.')
-
-        if pairlists[0]['method'] == "RemotePairList" and self._mode == 'blacklist':
+        if self._pairlist_pos == 0 and self._mode == 'blacklist':
             raise OperationalException(
                 'At `blacklist` mode RemotePairList can not be on the first '
                 'position of your pairlist.')

tests/plugins/test_remotepairlist.py

@@ -239,7 +239,9 @@ def test_remote_pairlist_blacklist(mocker, rpl_config, caplog, markets, tickers)
     }
 
     rpl_config['pairlists'] = [
-        {'method': 'StaticPairList'},
+        {
+            "method": "StaticPairList",
+        },
         {
             "method": "RemotePairList",
             "mode": "blacklist",
@@ -262,7 +264,9 @@ def test_remote_pairlist_blacklist(mocker, rpl_config, caplog, markets, tickers)
     pairlistmanager = PairListManager(exchange, rpl_config)
 
     remote_pairlist = RemotePairList(exchange, pairlistmanager, rpl_config,
-                                     rpl_config['pairlists'][1], 0)
+                                     rpl_config["pairlists"][1], 1)
+
+    print(remote_pairlist._pairlistconfig)
 
     pairs, time_elapsed = remote_pairlist.fetch_pairlist()