BuildBucket recipe module can expose properties.

scripts/slave/recipe_modules/buildbucket/example.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """This file is a recipe demonstrating the buildbucket recipe module."""
 
 
 import json
 
 
 DEPS = [
     'buildbucket',
     'service_account',
     'recipe_engine/platform',
     'recipe_engine/properties',
     'recipe_engine/raw_io',
     'recipe_engine/step',
 ]
 
 
 def RunSteps(api):
+  if api.buildbucket.properties is None:
+    return
+
   build_parameters = {
       'builder_name': 'linux_perf_bisect',
       'properties': {
           'bisect_config': {
               'bad_revision': '351054',
               'bug_id': 537649,
               'command': ('src/tools/perf/run_benchmark -v '
                           '--browser=release --output-format=chartjson '
                           '--also-run-disabled-tests speedometer'),
               'good_revision': '351045',
@@ skipping 103 matching lines @@
          api.step_data(
              'buildbucket.put',
              stdout=api.raw_io.output(mock_buildbucket_multi_response)) +
          api.step_data(
              'buildbucket.get',
              stdout=api.raw_io.output(mock_buildbucket_single_response)) +
          api.platform('win', 32) +
          api.properties(
              buildbucket={'build': {'tags': [
                  'buildset:patch/rietveld/cr.chromium.org/123/10001']}}))
+
+  yield (api.test('no_properties'))