bug fix: errors occasionally

data/maker/__init__.py

@@ -105,8 +105,10 @@ class Learner(Process):
             _index = np.random.choice(np.arange(self._df[name].size),5,False)
             no_value = [type(value) in [int,float,np.int64,np.int32,np.float32,np.float64] for value in self._df[name].values[_index]]            
             no_value = 0 if np.sum(no_value) > 0 else ''
-            
+            try:
                 self._df[name] = self._df[name].fillna(no_value)
+            finally:
+                pass
             
             _log[name] = self._df[name].dtypes.name
         _log = {'action':'structure','input':_log}