From 846d43dd87747dfef24f05cc4d0ac483714bf3cc Mon Sep 17 00:00:00 2001
From: Sergio Cambra <sergio@programatica.es>
Date: Thu, 14 Mar 2013 14:11:21 +0100
Subject: only yield if block given

---
 lib/axlsx/drawing/line_chart.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/axlsx/drawing/line_chart.rb b/lib/axlsx/drawing/line_chart.rb
index e926fb79..645565a8 100644
--- a/lib/axlsx/drawing/line_chart.rb
+++ b/lib/axlsx/drawing/line_chart.rb
@@ -73,7 +73,7 @@ module Axlsx
         str_inner << '<c:varyColors val="' << vary_colors.to_s << '"/>'
         @series.each { |ser| ser.to_xml_string(str_inner) }
         @d_lbls.to_xml_string(str) if @d_lbls
-        yield str_inner
+        yield str_inner if block_given?
         str_inner << '<c:axId val="' << @catAxId.to_s << '"/>'
         str_inner << '<c:axId val="' << @valAxId.to_s << '"/>'
         str_inner << '<c:axId val="' << @serAxId.to_s << '"/>'
-- 
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