Django - FileField check if None

I have a model with an optional file field

class MyModel(models.Model):
  name = models.CharField(max_length=50)
  sound = models.FileField(upload_to='audio/', blank=True)

Let's put a value

>>> test = MyModel(name='machin')
>>> test.save()

Why do I get that ?

>>> test.sound
<FieldFile: None>
>>> test.sound is None
False

How can I check if there is a file set ?

if test.sound.name: 
     print "I have a sound file"
else:   
     print "no sound"

Also, FieldFile's boolean value will be False when there's no file: bool(test.sound) == False when test.sound.name is falsy.

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