[Predator] Refactor ToPublishResult and fix keyerror 'found'

appengine/findit/crash/crash_pipeline.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.
 
 import copy
 import json
 import logging
 
 from common import appengine_util
 from common import pubsub_util
@@ skipping 161 matching lines @@
   def run(self, *_args, **_kwargs): # pragma: no cover
     """Publish the results of our analysis back into the ndb.Model.
 
     N.B., due to the structure of AppEngine pipelines, this method must
     accept the same arguments as are passed to ``__init__``; however,
     because they were already passed to ``__init__`` there's no use in
     recieving them here. Thus, we discard all the arguments to this method
     (except for ``self``, naturally).
     """
     analysis = self._findit.GetAnalysis(self._crash_identifiers)
-    if analysis.failed:
+    if analysis.failed or not analysis.result:
       logging.info('Can\'t publish result to %s because analysis failed:\n%s',
                    self.client_id, repr(self._crash_identifiers))
       return
 
     result = analysis.ToPublishableResult(self._crash_identifiers)
     messages_data = [json.dumps(result, sort_keys=True)]
 
     # TODO(http://crbug.com/659354): remove Findit's dependency on CrashConfig.
     client_config = self._findit.config
     # TODO(katesonia): Clean string uses in config.
@@ skipping 27 matching lines @@
     N.B., due to the structure of AppEngine pipelines, this method must
     accept the same arguments as are passed to ``__init__``; however,
     because they were already passed to ``__init__`` there's no use in
     recieving them here. Thus, we discard all the arguments to this method
     (except for ``self``, naturally).
     """
     run_analysis = yield CrashAnalysisPipeline(
         self._client_id, self._crash_identifiers)
     with pipeline.After(run_analysis):
       yield PublishResultPipeline(self._client_id, self._crash_identifiers)