[perf] Be tolerant of git show failures.

Change-Id: I5636598fb6cebad3378a318faf6e0b7497169194
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/580316
Commit-Queue: Joe Gregorio <jcgregorio@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>
diff --git a/perf/go/frontend/frontend.go b/perf/go/frontend/frontend.go
index 299f725..3bccf6a 100644
--- a/perf/go/frontend/frontend.go
+++ b/perf/go/frontend/frontend.go
@@ -646,8 +646,8 @@
 	}
 	logEntry, err := f.perfGit.LogEntry(ctx, cids[0])
 	if err != nil {
-		httputils.ReportError(w, err, "Failed to get log entry", http.StatusInternalServerError)
-		return
+		logEntry = "<<< Failed to load >>>"
+		sklog.Errorf("Failed to get log entry: %s", err)
 	}
 
 	resp := CIDHandlerResponse{