default widget link.

make sure to run
rake migrate:make_default_widget_work_config
for changing announcement module app

lib/parsers/parser_common.rb

@@ -210,6 +210,7 @@ module ParserCommon
                 when 'default_widget'
                     "/panel/orbit_app/widget/#{part.widget_style}?inner=true"
                   else
+                    raise ModuleAppError,"PagePart can't find ModuleApp"   if part.module_app.nil?
                     "/panel/#{part.module_app.key}/widget/#{part.widget_path}?inner=true&widget_options=#{part.widget_options_uri}"
                 end
           options = "&part_id=#{part.id}&category_id=#{!part[:category].blank? ? part[:category].blank? : category}&tag_id=#{!part[:tag].blank? ? part[:tag] : tag}&page=#{params[:page]}&search_query=#{params[:search_query]}&part_title=#{Rack::Utils.escape(part_title).gsub("+", "%20") rescue nil}"