if target_user.nil? and !display_name.blank?
target_user = User.find(:first, :conditions => [ "visible = ? and display_name = ?", true, display_name])
if target_user.nil?
+ @title = t'trace.no_such_user.title'
@not_found_user = display_name
render :action => 'no_such_user', :status => :not_found
return