Owner cannot be nil

Otherwise ready? or blocked? would issue a Nil pointer exception

lib/dor/workflow/document.rb

@@ -8,15 +8,15 @@ class Document
       t.root(:path => 'workflow')
       t.repository(:path => {:attribute => 'repository'})
       t.workflowId(:path => {:attribute => 'id'})
-      t.process {
+      t.process do
         t.name_(:path => {:attribute => 'name'})
         t.status(:path => {:attribute => 'status'})
         t.timestamp(:path => {:attribute => 'datetime'}) # , :data_type => :date)
         t.elapsed(:path => {:attribute => 'elapsed'})
         t.lifecycle(:path => {:attribute => 'lifecycle'})
         t.attempts(:path => {:attribute => 'attempts'}, :index_as => [:not_searchable])
         t.version(:path => {:attribute => 'version'})
-      }
+      end
     end
 
     @@definitions = {}

lib/dor/workflow/process.rb

@@ -82,8 +82,10 @@ def elapsed
       @attrs['elapsed'].nil? ? nil : @attrs['elapsed'].to_f
     end
 
-    def update!(info, new_owner = nil)
-      @owner = new_owner unless new_owner.nil?
+    # @param info [Nokogiri::XML::Element]
+    # @param new_owner [Dor::Workflow::Document]
+    def update!(info, new_owner)
+      @owner = new_owner
       if info.is_a? Nokogiri::XML::Node
         info = Hash[info.attributes.collect { |k, v| [k, v.value] }]
       end