Remove 204-NoContent, Flask, and Werkzeug no longer provide

public apis to add additional error code exception handling.

test/test_app_error.py

@@ -16,12 +16,6 @@ def mock_puppetdb_environments(mocker):
                                return_value=environemnts)
 
 
-def test_error_no_content():
-    result = app.no_content(None)
-    assert result[0] == ''
-    assert result[1] == 204
-
-
 def test_error_bad_request(mock_puppetdb_environments):
     with app.app.test_request_context():
         (output, error_code) = app.bad_request(None)

test/test_utils.py

@@ -12,7 +12,6 @@ from werkzeug.exceptions import NotFound, InternalServerError
 
 from puppetboard import utils
 from puppetboard import app
-from puppetboard.app import NoContent
 
 from bs4 import BeautifulSoup
 import logging
@@ -108,19 +107,6 @@ def test_http_connection_error(mock_log):
         mock_log.error.assert_called_with(err)
 
 
-def test_http_empty(mock_log, mocker):
-    err = "Empty Response"
-
-    def connection_error():
-        raise EmptyResponseError(err)
-
-    flask_abort = mocker.patch('flask.abort')
-    with pytest.raises(NoContent):
-        utils.get_or_abort(connection_error)
-        mock_log.error.assert_called_with(err)
-        flask_abort.assert_called_with('204')
-
-
 def test_db_version_good(mocker, mock_info_log):
     mocker.patch.object(app.puppetdb, 'current_version', return_value='4.2.0')
     err = 'PuppetDB Version %d.%d.%d' % (4, 2, 0)