Only set localized values are now serialized

lib/spira/base.rb

@@ -329,7 +329,7 @@ def read_attribute(name)
     def merge_localized_property(name, arg)
       values = read_attribute("#{name}_native")
       values.delete_if { |s| s.language == I18n.locale }
-      values << serialize_localized_property(arg, I18n.locale)
+      values << serialize_localized_property(arg, I18n.locale) if arg
       values
     end
 

spec/localized_attributes_spec.rb

@@ -6,12 +6,10 @@
 
 describe Spira do
 
-  before :all do
-    class ::Concept < Spira::Base
-      configure :base_uri => "http://example.org/example/"
-      property :label, :predicate => RDFS.label, :localized => true
-      property :num_employees, :predicate => RDF::URI.new('http://example.org/example/identifier')
-    end
+  class ::Concept < Spira::Base
+    configure :base_uri => "http://example.org/example/"
+    property :label, :predicate => RDF::RDFS.label, :localized => true
+    property :num_employees, :predicate => RDF::URI.new('http://example.org/example/identifier')
   end
 
   let(:company) {
@@ -88,5 +86,14 @@ class ::Concept < Spira::Base
         expect(company.label_native.length).to eql 2
       end
     end
+
+    describe "#save" do
+      it "only serializes the set values" do
+        I18n.locale = :en
+        company.label = nil
+        company.save!
+        expect(Spira.repository.size).to eq 2
+      end
+    end
   end
 end