Miscellany

Here is my function: 

 def list
    @fr_pages, @frs = paginate :frs, :per_page => 10
    if Fr.find(params[:id]) == ""
            flash[:notice] = 'Veuillez rentrer une nouvelle fois votre matricule svp =)'
            redirect_to :controller => 'hello', :action => 'index'
    end

    @mfr = Fr.find(params[:id])
  end


When I call this url: http://site.com/main/action/list ive got this error: Couldn't find Fr without an ID. Does anyone know why redirect_to does not work please ?