Fix bug when editing a page, the theme wasn't including blank

app/views/admin/pages/_form.html.erb

@@ -25,7 +25,7 @@
 <p>
 	<%= t('admin.theme') %>
 	<% if @design %>
-		<%= f.select :theme_id, @design.themes.collect { |t| [t.name.capitalize, t.id] }%>
+		<%= f.select :theme_id, @design.themes.collect { |t| [t.name.capitalize, t.id] }, :include_blank => true %>
 	<% else %>
 		<%= f.select :theme_id, @default_design.themes.collect { |t| [t.name.capitalize, t.id] }, :include_blank => true %>
 	<% end %>