PEP8 cleanup

Signed-off-by: Jason Myers <jason@jasonamyers.com>

tests/delete/models.py

@@ -109,20 +109,26 @@ class HiddenUser(models.Model):
 class HiddenUserProfile(models.Model):
     user = models.ForeignKey(HiddenUser)
 
+
 class M2MTo(models.Model):
     pass
 
+
 class M2MFrom(models.Model):
     m2m = models.ManyToManyField(M2MTo)
 
+
 class Parent(models.Model):
     pass
 
+
 class Child(Parent):
     pass
 
+
 class Base(models.Model):
     pass
 
+
 class RelToBase(models.Model):
     base = models.ForeignKey(Base, on_delete=models.DO_NOTHING)