try overriding it like that (i just took the code from github and
added an if-clause):

  def in_place_edit_for(object, attribute, options = {})
    define_method("set_#{object}_#{attribute}") do
      @item = object.to_s.camelize.constantize.find(params[:id])
      # adjust the following if-clause to your needs
      if params[:value].blank?
        params[:value] = "..."
      end
      @item.update_attribute(attribute, params[:value])
      render :text => @item.send(attribute).to_s
    end
  end

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