create emailer version 1

env/Lib/site-packages/django/contrib/sites/checks.py

@@ -0,0 +1,12 @@
+from django.conf import settings
+from django.core.checks import Error
+
+
+def check_site_id(app_configs, **kwargs):
+    if hasattr(settings, "SITE_ID") and not isinstance(
+        settings.SITE_ID, (type(None), int)
+    ):
+        return [
+            Error("The SITE_ID setting must be an integer", id="sites.E101"),
+        ]
+    return []