OK, I created a minimal scenario for reproducing the error:

append these lines to the welcome db.py, create test.jpg in root folder and 
deploy directly to GAE:

db.define_table('table1',
Field('image', 'upload'),
)
db.table1.insert(image =  open('test.jpg', 'rb'))


Then call welcome/appadmin and you will see that clicking on the "file" 
link downloads an empty image because the blob data is empty.
table1.idtable1.imagetable1.image_blob37001*file*None

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