Remove None values (urlencode raises TypeError in Django 2.2)

To catch usage mistakes, the test Client and
django.utils.http.urlencode() now raise TypeError if None is passed as
a value to encode because None can’t be encoded in GET and POST
data. Either pass an empty string or omit the value.

Author: humitos

readthedocs/rtd_tests/tests/test_project.py

@@ -452,6 +452,10 @@ def test_user_cant_change_lang_to_translation_lang(self):
         self.assertEqual(project_a.language, 'en')
         self.assertEqual(project_b.language, 'es')
         data = model_to_dict(project_a)
+
+        # Remove None values from data
+        data = {k: v for k, v in data.items() if v is not None}
+
         data['language'] = 'es'
         resp = self.client.post(
             reverse(
@@ -485,6 +489,10 @@ def test_user_can_change_project_with_same_lang(self):
         self.assertEqual(project_a.language, 'en')
         self.assertEqual(project_b.language, 'es')
         data = model_to_dict(project_a)
+
+        # Remove None values from data
+        data = {k: v for k, v in data.items() if v is not None}
+
         # Same language
         data['language'] = 'en'
         resp = self.client.post(