Why are there no output results ?

OK is normally printed. The test results are saved in HTML format. But，when a test result fails, there is no output.

This is the command line I wrote and the result：

1.normally，
[root@node1 s3-tests]# S3TEST_CONF=test.conf ./virtualenv/bin/nosetests s3tests.functional.test_s3:test_ranged_request_response_code --with-html --html-report=/var/www/html/index.html --html-report-template=virtualenv/lib/python2.7/site-packages/nose_html_reporting/templates/report2.jinja2 -v
s3tests.functional.test_s3.test_ranged_request_response_code ... ok

----------------------------------------------------------------------
HTML: /var/www/html/index.html
----------------------------------------------------------------------
Ran 1 test in 0.916s

OK

2.An error condition
[root@node1 s3-tests]# S3TEST_CONF=test.conf ./virtualenv/bin/nosetests s3tests.functional.test_s3:test_versioning_obj_suspend_versions --with-html --html-report=/var/www/html/index.html --html-report-template=virtualenv/lib/python2.7/site-packages/nose_html_reporting/templates/report2.jinja2 -v
s3tests.functional.test_s3.test_versioning_obj_suspend_versions ... FAIL
[root@node1 s3-tests]#

Why are there no output results ?