chromium_tests: raise infra failure when no compile targets are specified

scripts/slave/recipe_modules/chromium_tests/api.py

 # Copyright 2014 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.
 
 import contextlib
 import copy
 import itertools
 import json
 
 from recipe_engine.types import freeze
@@ skipping 429 matching lines @@
       # those may be the values of the continuous builder the trybot may
       # be configured to match; we need to use the actual mastername
       # and buildername we're running on, because it may be configured
       # with different MB settings.
       real_mastername = self.m.properties['mastername']
       real_buildername = self.m.properties['buildername']
       self.m.chromium.run_mb(real_mastername, real_buildername,
                              isolated_targets=isolated_targets,
                              name='generate_build_files%s' % name_suffix)
 
+    if not compile_targets:
+      raise self.m.step.InfraFailure('Misconfigured bot: no compile targets')
     self.m.chromium.compile(compile_targets, name='compile%s' % name_suffix)
 
   def tests_for_builder(self, mastername, buildername, update_step, master_dict,
                         override_bot_type=None):
     got_revision = update_step.presentation.properties['got_revision']
 
     bot_config = master_dict.get('builders', {}).get(buildername)
     master_config = master_dict.get('settings', {})
 
     bot_type = override_bot_type or bot_config.get('bot_type', 'builder_tester')
@@ skipping 301 matching lines @@
   def get_compile_targets_for_scripts(self):
     return self.m.python(
         name='get compile targets for scripts',
         script=self.m.path['checkout'].join(
             'testing', 'scripts', 'get_compile_targets.py'),
         args=[
             '--output', self.m.json.output(),
             '--',
         ] + self.get_common_args_for_scripts(),
         step_test_data=lambda: self.m.json.test_api.output({}))