Fixed #29094 -- Fixed crash when entering an invalid uuid in ModelAdmin.raw_id_fields.

Regression in 2f9861d823.

Thanks Carel Burger for the report and fix.

tests/admin_widgets/models.py

@@ -1,3 +1,5 @@
+import uuid
+
 from django.contrib.auth.models import User
 from django.db import models
 
@@ -92,6 +94,7 @@ class CarTire(models.Model):
 
 
 class Honeycomb(models.Model):
+    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     location = models.CharField(max_length=20)