From be70bbfed2f5b3032d166bac549e7dec4d713135 Mon Sep 17 00:00:00 2001
From: Cody Soyland <cody@soyland.org>
Date: Thu, 15 Mar 2018 15:27:48 -0500
Subject: [PATCH] Fix bug: backend won't store empty strings.

---
 diagnostics.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/diagnostics.go b/diagnostics.go
index 08d77a03c..3ad07ed42 100644
--- a/diagnostics.go
+++ b/diagnostics.go
@@ -148,6 +148,13 @@ func (d *DiagnosticsCollector) encode() ([]byte, error) {
 
 // Set adds a key value metric.
 func (d *DiagnosticsCollector) Set(name string, value interface{}) {
+	switch v := value.(type) {
+	case string:
+		if v == "" {
+			// Do not set empty string
+			return
+		}
+	}
 	d.mu.Lock()
 	defer d.mu.Unlock()
 	d.metrics[name] = value