Improved exception text in distributor_factory.py a little bit.

d2o/distributor_factory.py

@@ -84,7 +84,7 @@ class _distributor_factory(object):
             if not all(x == strat_list[0] for x in strat_list):
                 raise ValueError(about_cstring(
                     "ERROR: The distribution-strategy must be the same on " +
-                    "all nodes!"))
+                    "all nodes! Got: %s") % distribution_strategy)
 
         # Check for an hdf5 file and open it if given
         if 'h5py' in gdi and alias is not None: