Fixed #31783 -- Fixed crash when filtering againts "negate" field.

Thanks Simon Charette for the initial patch.

tests/queries/models.py

@@ -42,6 +42,7 @@ class Note(models.Model):
     note = models.CharField(max_length=100)
     misc = models.CharField(max_length=10)
     tag = models.ForeignKey(Tag, models.SET_NULL, blank=True, null=True)
+    negate = models.BooleanField(default=True)
 
     class Meta:
         ordering = ['note']