report.rb

class Report
  def date_reported_formatted(format='%m/%d/%Y ')
    date_reported.strftime(format)
  end
end

class NullReport
  def method_missing(meth, *args)
    "No Report"
  end
end

result.rb

class Result
  def active_report
    active_reports.first || NullReport.new
  end

  def get_date_of_report
    active_report.date_reported_formatted
  end

  def get_datetime_result_date_of_report
    active_report.date_reported
  end
end