Merge pull request #5531 from ghjm/login_redirect_null_issue

Set a default value for LOGIN_REDIRECT_URL

Reviewed-by: https://github.com/apps/softwarefactory-project-zuul

awx/api/conf.py

@@ -67,6 +67,7 @@ register(
     field_class=fields.CharField,
     allow_blank=True,
     required=False,
+    default='',
     label=_('Login redirect override URL'),
     help_text=_('URL to which unauthorized users will be redirected to log in. '
                 'If blank, users will be sent to the Tower login page.'),