Html Test report is blank when generated

When I run my code, it produces the HTML code in the console and generates a report file but the report file is blank.

Here is the code I'm running:

from HTMLTestRunner import HTMLTestRunner

Debug.on(0);

class Test(unittest.TestCase):
    def setUp(self):
        utils.openApplication("Appname")
        Debug.info('Setup Called')

    def test_isupper(self):
        self.assertTrue('FOO'.isupper())
        self.assertFalse('Foo'.isupper())

if __name__ == '__main__':
    loader = unittest.TestLoader()
    suite = unittest.TestSuite((loader.loadTestsFromTestCase(Test)))

    outfile = file("Report.html", "w")
    runner = HTMLTestRunner()
    runner.run(suite)

I'm using Sikuli IDE 1.1.3, I tried using 2.0.4 but its not running there