lib/xml/mixup.rb in xml-mixup-0.1.15 vs lib/xml/mixup.rb in xml-mixup-0.1.16

@@ -61,11 +61,12 @@
   # @param obj [Object] the object to be flattened
   # @param args [Array, nil] callback arguments
   #
   # @return [String] the attribute in question.
   #
-  def flatten_attr obj, args
+  def flatten_attr obj, args = []
     return if obj.nil?
+    args ||= []
     # early bailout for most likely condition
     if ATOMS.any? { |x| obj.is_a? x }
       obj.to_s
     elsif obj.is_a? Hash
       tmp = obj.sort.map do |kv|