Merge pull request freqtrade#12413 from hippocritical/develop

add np.NAN to strategy updater conversion (which worked in 1.x but not in 2.x anymore)

Author: xmatthias

freqtrade/strategy/strategyupdater.py

@@ -46,6 +46,7 @@ class StrategyUpdater:
             "aliases": set(),
             "replacements": [
                 ("NaN", "nan"),
+                ("NAN", "nan"),
             ],
         }
     }