[Findit] Fix Key error in build_failure handler.

appengine/findit/handlers/build_failure.py

Index: appengine/findit/handlers/build_failure.py
diff --git a/appengine/findit/handlers/build_failure.py b/appengine/findit/handlers/build_failure.py
index 16245b68fc64e27ffe65911c5501500704b58260..9b75d58baa75fc41ca96a38be1535ed9ee64d537 100644
--- a/appengine/findit/handlers/build_failure.py
+++ b/appengine/findit/handlers/build_failure.py
@@ -253,11 +253,14 @@ def _GetAnalysisResultWithTryJobInfo(
           'supported': heuristic_result['supported']
       }
 
-      if try_job_result['status'] == result_status.FLAKY:
-        step_updated_results['flaky_failures'].append(final_result)
-      elif try_job_result['status'] in NO_TRY_JOB_REASON_MAP.values():
+      if ('status' not in try_job_result or
+          try_job_result['status'] in NO_TRY_JOB_REASON_MAP.values()):
         # There is no try job info but only heuristic result.
+        try_job_result['status'] = try_job_result.get(
+            'status', result_status.UNKNOWN)
         step_updated_results['unclassified_failures'].append(final_result)
+      elif try_job_result['status'] == result_status.FLAKY:
+        step_updated_results['flaky_failures'].append(final_result)
       else:
         step_updated_results['reliable_failures'].append(final_result)