Attempt to a quick correction

app/views/versions/index.haml

@@ -24,7 +24,7 @@
           version.changeset.each do |key, val|
             changes += version.item_type.constantize.human_attribute_name(key)
             changes += ': '
-            if key == 'description'
+            if key == 'description' && val[0].present? && val[1].present?
               changes += Differ.diff(val[1], val[0]).to_s
             else
               changes += "#{val[0]} -> #{val[1]}"

app/views/versions/index.rss.builder

@@ -60,7 +60,7 @@ xml.rdf :RDF,
           version.changeset.each do |key, val|
             changes += version.item_type.constantize.human_attribute_name(key)
             changes += ': '
-            if key == 'description'
+            if key == 'description' && val[0].present? && val[1].present?
               changes += Differ.diff(val[1], val[0]).to_s
             else
               changes += "#{val[0]} -> #{val[1]}"