I have to display a calculated property in the model admin's list_display.
```python
class A:
# attributes
class B:
a = models.OneToOneField(A, on_delete=models.CASCADE,
related_name='b_obj')
timestamp = models.DateTimeField()
class AProxy(A):
@property
def calc_prop(self):
return self.b_obj.timestamp if self.b_obj else 'Some text'
class Meta:
proxy = True
```
When I display this `calc_prop` in model admin's list view I always get `-`
if there is no corresponding `b_obj` related object on AProxy's object.
What am I doing wrong here?
Thanks!
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