[Findit] fix bug when display confidence score on SoM.

appengine/findit/waterfall/suspected_cl_util.py

Index: appengine/findit/waterfall/suspected_cl_util.py
diff --git a/appengine/findit/waterfall/suspected_cl_util.py b/appengine/findit/waterfall/suspected_cl_util.py
index c84b01eec256405c0e7a58211458238d5aa55d56..3432279763ebd13032d8b0d0688b58a50f42f4d2 100644
--- a/appengine/findit/waterfall/suspected_cl_util.py
+++ b/appengine/findit/waterfall/suspected_cl_util.py
@@ -120,12 +120,14 @@ def _HasNewFailures(current_failures, new_failures):
 
 def GetSuspectedCLConfidenceScoreAndApproach(
     confidences, cl_from_analyzed_build, cl_from_first_failed_build):
-  if not confidences or not cl_from_analyzed_build:
+  if not confidences or (
+      not cl_from_analyzed_build and not cl_from_first_failed_build):
     return None, None
 
-  if (cl_from_first_failed_build and not _HasNewFailures(
-          cl_from_analyzed_build.get('failures'),
-          cl_from_first_failed_build.get('failures'))):
+  if (cl_from_first_failed_build and (
+          not cl_from_analyzed_build or
+          not _HasNewFailures(cl_from_analyzed_build.get('failures'),
+                              cl_from_first_failed_build.get('failures')))):
       # For non-first-time failures, the try job result is not recorded.
       # If there is no new failures in current build, use first failed build to
       # make sure the confidence score is correct.