Fix for email sending (#9526)

* Fix for email sending

- Extract valid email for user
- Do not send if email not configured for user

* Improve email address filtering logic

* Fix return type hint

src/backend/InvenTree/InvenTree/helpers_email.py

@@ -4,6 +4,7 @@ from django.conf import settings
 from django.core import mail as django_mail
 
 import structlog
+from allauth.account.models import EmailAddress
 
 import InvenTree.ready
 import InvenTree.tasks
@@ -56,7 +57,6 @@ def send_email(subject, body, recipients, from_email=None, html_message=None):
         recipients = [recipients]
 
     import InvenTree.ready
-    import InvenTree.status
 
     if InvenTree.ready.isImportingData():
         # If we are importing data, don't send emails
@@ -89,3 +89,19 @@ def send_email(subject, body, recipients, from_email=None, html_message=None):
         html_message=html_message,
         group='notification',
     )
+
+
+def get_email_for_user(user) -> str:
+    """Find an email address for the specified user."""
+    # First check if the user has an associated email address
+    if user.email:
+        return user.email
+
+    # Otherwise, find first matching email
+    # Priority is given to primary or verified email addresses
+    if (
+        email := EmailAddress.objects.filter(user=user)
+        .order_by('-primary', '-verified')
+        .first()
+    ):
+        return email.email

src/backend/InvenTree/InvenTree/tasks.py

@@ -705,4 +705,7 @@ def email_user(user_id: int, subject: str, message: str) -> None:
         logger.warning('User <%s> not found - cannot send welcome message', user_id)
         return
 
-    user.email_user(subject=subject, message=message)
+    from InvenTree.helpers_email import get_email_for_user, send_email
+
+    if email := get_email_for_user(user):
+        send_email(subject, message, [email])