From 78bfed8f5ab1de0096174795635cd41dc1bea43a Mon Sep 17 00:00:00 2001
From: Erik Veijola <erik.veijola@intel.com>
Date: Tue, 28 Jul 2015 15:15:43 +0300
Subject: num_val.rb, str_val.rb: added checking for nil values in
 to_xml_string

Signed-off-by: Erik Veijola <erik.veijola@intel.com>
---
 lib/axlsx/drawing/num_val.rb | 4 +++-
 lib/axlsx/drawing/str_val.rb | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/axlsx/drawing/num_val.rb b/lib/axlsx/drawing/num_val.rb
index bd733cb7..b430c4b6 100644
--- a/lib/axlsx/drawing/num_val.rb
+++ b/lib/axlsx/drawing/num_val.rb
@@ -26,7 +26,9 @@ module Axlsx
     # serialize the object
     def to_xml_string(idx, str = "")
       Axlsx::validate_unsigned_int(idx)
-      str << ('<c:pt idx="' << idx.to_s << '" formatCode="' << format_code << '"><c:v>' << v.to_s << '</c:v></c:pt>')
+      if !v.to_s.empty?
+        str << ('<c:pt idx="' << idx.to_s << '" formatCode="' << format_code << '"><c:v>' << v.to_s << '</c:v></c:pt>')
+      end
     end
   end
 end
diff --git a/lib/axlsx/drawing/str_val.rb b/lib/axlsx/drawing/str_val.rb
index b0692784..10a4fe91 100644
--- a/lib/axlsx/drawing/str_val.rb
+++ b/lib/axlsx/drawing/str_val.rb
@@ -26,7 +26,9 @@ module Axlsx
     # serialize the object
     def to_xml_string(idx, str = "")
       Axlsx::validate_unsigned_int(idx)
-      str << ('<c:pt idx="' << idx.to_s << '"><c:v>' << v.to_s << '</c:v></c:pt>')
+      if !v.to_s.empty?
+        str << ('<c:pt idx="' << idx.to_s << '"><c:v>' << v.to_s << '</c:v></c:pt>')
+      end
     end
   end
 end
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