Fix bug.

app/helpers/announcements_helper.rb

@@ -201,6 +201,9 @@ module AnnouncementsHelper
       tags = page.tags
       tags = params[:tags] if params[:tags].present?
       categories = params['category']=='all' ? (page.categories || []) : (Array(params['category']) rescue (page.categories || []))
+      if params['category'].present?
+        tags = ["all"]
+      end
     end
     if !params["source"].present?
       if @type == "show_widget"