Fixed occurrence of np.int8

d2o/distributed_data_object.py

@@ -750,6 +750,8 @@ class distributed_data_object(Loggable, Versionable, object):
             # use common datatype for self and other
             new_dtype = np.dtype(np.find_common_type((self.dtype,),
                                                      (result_data.dtype,)))
+            if new_dtype == np.int8:
+                new_dtype == np.int16
             temp_d2o = self.copy_empty(dtype=new_dtype)
 
         # write the new data into the return-distributed_data_object