add *.pyc to .gitignore; remove repeated INSTALLED_APPS from test_project.settings; fix check dj-database-url returned None values to empty string

.gitignore

@@ -4,4 +4,5 @@ docs/_build
 *.egg
 test.db
 build/
-.tox/
+.tox/
+*.pyc

test_project/test_project/settings.py

@@ -160,20 +160,6 @@ class Base(Configuration):
         }
     }
 
-    INSTALLED_APPS = (
-        'django.contrib.auth',
-        'django.contrib.contenttypes',
-        'django.contrib.sessions',
-        'django.contrib.sites',
-        'django.contrib.messages',
-        'django.contrib.staticfiles',
-        # Uncomment the next line to enable the admin:
-        # 'django.contrib.admin',
-        # Uncomment the next line to enable admin documentation:
-        # 'django.contrib.admindocs',
-        'configurations',
-    )
-
 
 class Debug(Base):
     YEAH = True

tests/test_values.py

@@ -246,11 +246,11 @@ class ValueTests(TestCase):
             self.assertEqual(value.setup('DATABASE_URL'), {
                 'default': {
                     'ENGINE': 'django.db.backends.sqlite3',
-                    'HOST': None,
+                    'HOST': '',
                     'NAME': ':memory:',
-                    'PASSWORD': None,
-                    'PORT': None,
-                    'USER': None,
+                    'PASSWORD': '',
+                    'PORT': '',
+                    'USER': '',
                 }})
 
     def test_email_url_value(self):