missing imports in production setting added

eva/settings_production.py

@@ -10,8 +10,12 @@ For the full list of settings and their values, see
 https://docs.djangoproject.com/en/3.1/ref/settings/
 """
 
+import json
+import os
 from pathlib import Path
 
+from django.core.exceptions import ImproperlyConfigured
+
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent