[1.9.x] Fixed #22705 -- Fixed QuerySet.bulk_create() on models without any fields on Oracle.

Fixed on other backends by 134ca4d438.

Thanks Mariusz Felisiak for the solution.

Backport of 7a5b7e35bf from master

tests/bulk_create/models.py

@@ -47,3 +47,7 @@ class State(models.Model):
 class TwoFields(models.Model):
     f1 = models.IntegerField(unique=True)
     f2 = models.IntegerField(unique=True)
+
+
+class NoFields(models.Model):
+    pass