Bhattacharyya: Impute missing values

Author: VesnaT

Orange/distance/distance.py

@@ -757,6 +757,7 @@ def _bhattacharyya(a, b):
 class Bhattacharyya(Distance):
     supports_discrete = False
     supports_sparse = True
+    supports_missing = False
 
     def fit(self, data):
         return BhattacharyyaModel(self.axis, self.impute)