From 1070a35db8aa6414cf53bcce92c1355986cbc53b Mon Sep 17 00:00:00 2001
From: gebele <gebele@in-silico.ch>
Date: Thu, 26 Mar 2015 17:09:00 +0100
Subject: avoid data_entries nil error

---
 lib/dataset.rb | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/dataset.rb b/lib/dataset.rb
index ce5fc07..d7c4076 100644
--- a/lib/dataset.rb
+++ b/lib/dataset.rb
@@ -261,7 +261,6 @@ module OpenTox
     def to_ntriples # redefined string version for better performance
       ntriples = ""
       @metadata[RDF.type] = [ RDF::OT.Dataset, RDF::OT.OrderedDataset ]
-
       @metadata.each do |predicate,values|
         [values].flatten.each do |value|
           URI.valid?(value) ? value = "<#{value}>" : value = "\"#{value}\""
@@ -295,7 +294,7 @@ module OpenTox
           ntriples <<  "#{data_entry_node} <#{RDF::OT.values}> #{value_node} .\n"
           ntriples <<  "#{value_node} <#{RDF::OT.feature}> <#{@features[j].uri}> .\n"
           ntriples <<  "#{value_node} <#{RDF::OT.value}> \"#{value}\" .\n"
-        end
+        end unless @data_entries[i].nil?
       end
       ntriples
 
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