I found the solution to my own problem. When the page was reloading,
I am guessing that the actual entity had not been deleted yet, and the
method __unicode__(self) was being called, requesting access of
self.image (which did not exist, because that HAD been deleted).
A simple modification to the method seems to have fixed the problem:
def __unicode__(self):
if (self.image):
return self.image.path
else:
return 'No image exists... I should be deleted any moment!'
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