move parent_id form attribute to its own partial

app/views/projects/form/_project_attributes.html.erb

@@ -1,11 +1,6 @@
 <p><%= form.text_field :name, :required => true, :size => 60 %></p>
 
-<% unless project.allowed_parents.compact.empty? %>
+<%= render :partial => "projects/form/attributes/parent_id", :locals => { :project => project } %>
-  <p>
-    <%= label(:project, :parent_id, Project.human_attribute_name(:parent)) %>
-    <%= parent_project_select_tag(project) %>
-  </p>
-<% end %>
 
 <p><%= form.text_area :summary, :rows => 2, :class => 'wiki-edit' %></p>
 <p><%= form.text_area :description, :rows => 5, :class => 'wiki-edit' %></p>

app/views/projects/form/attributes/_parent_id.html.erb

@@ -0,0 +1,6 @@
+<% unless project.allowed_parents.compact.empty? %>
+  <p>
+    <%= label(:project, :parent_id, Project.human_attribute_name(:parent)) %>
+    <%= parent_project_select_tag(project) %>
+  </p>
+<% end %>