Return default from hash client (#352)

Author: Pankrat

pymemcache/client/hash.py

@@ -357,7 +357,8 @@ def set(self, key, *args, **kwargs):
         return self._run_cmd('set', key, False, *args, **kwargs)
 
     def get(self, key, *args, **kwargs):
-        return self._run_cmd('get', key, None, *args, **kwargs)
+        default = kwargs.get('default', None)
+        return self._run_cmd('get', key, default, *args, **kwargs)
 
     def incr(self, key, *args, **kwargs):
         return self._run_cmd('incr', key, False, *args, **kwargs)

pymemcache/test/test_client_hash.py

@@ -257,6 +257,8 @@ def test_no_servers_left_with_commands_return_default_value(self):
 
         result = client.get('foo')
         assert result is None
+        result = client.get('foo', default='default')
+        assert result == 'default'
         result = client.set('foo', 'bar')
         assert result is False