i think it's dillema in here
if request.vars.image != None:
# this work when the image is there, can't work if the image is empty 
(leave blank), it return an error traceback said : AttributeError: 'str' 
object has no attribute 'filename'

if request.vars.image:
# this work when the image is blank, but when you upload the file in image, 
the image_filename is empty / None

tested in web2py recent version
def create(table, fields, redirect):
form = SQLFORM(table, fields = fields)

#if current.request.vars.attachment:
if current.request.vars.attachment != None:
form.vars.attachment_filename = current.request.vars.attachment.filename

if form.process().accepted:
current.response.flash = 'Form accepted'
#redirect(URL(redirect) )
elif form.errors:
current.response.flash = 'Form has errors'
else:
current.response.flash = 'Please fill out the form'
return dict(form = form)

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