[web/json] an empty rset is just fine for ejsonexport
The ejsonexport view can just return an empty list for an empty rset.
Closes #4005518
import unittest
from cubicweb.web import http_headers
class TestGenerators(unittest.TestCase):
def test_generate_true_false(self):
for v in (True, 1, 'true', 'True', 'TRUE'):
self.assertEqual('true', http_headers.generateTrueFalse(v))
for v in (False, 0, 'false', 'False', 'FALSE'):
self.assertEqual('false', http_headers.generateTrueFalse(v))
with self.assertRaises(ValueError):
http_headers.generateTrueFalse('any value')