Merge pull request #1471 from helinwang/fix_gm

fix parameters.append_gradient_machine

python/paddle/v2/parameters.py

@@ -224,6 +224,7 @@ class Parameters(object):
                 except ValueError:
                     # If no such parameter in gradient machine, then don't copy
                     pass
+
         self.__gradient_machines__.append(gradient_machine)