From 07a9e44b86eff660e55bc1044a667eda7b981973 Mon Sep 17 00:00:00 2001
From: Sun He <sunheehnus@gmail.com>
Date: Mon, 8 Dec 2014 11:43:32 +0800
Subject: [PATCH] sparkline.c: AddSample skip Empty label

---
 src/sparkline.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sparkline.c b/src/sparkline.c
index 3355a598..8e2764ae 100644
--- a/src/sparkline.c
+++ b/src/sparkline.c
@@ -63,7 +63,7 @@ struct sequence *createSparklineSequence(void) {
 
 /* Add a new sample into a sequence. */
 void sparklineSequenceAddSample(struct sequence *seq, double value, char *label) {
-    label = label == NULL ? label : zstrdup(label);
+    label = (label == NULL || label[0] == '\0') ? NULL : zstrdup(label);
     if (seq->length == 0) {
         seq->min = seq->max = value;
     } else {