Hello
i have a table with integer field.
i populated thhe db from a csv (created from other then me).
it sometimes has empty value for the integers fields.
So when i try to get a list of the records of the table, i got:
type 'exceptions.ValueError'> invalid literal for long() with base 10: ''

from db.py  #table prodotti
Field("lunghezza","integer"),
Field("larghezza","integer"),

from default.py
prodotti = legacy_db().select(legacy_db.prodotti.ALL,orderby='prodotti.id 
DESC', limitby=limitby)

The error ticket:
File 
"/home/marcello/scripts/web2py/2/web2py/applications/PROVE/controllers/default.py",
 
line 171, in lista_prodotti
    prodotti = 
legacy_db().select(legacy_db.prodotti.ALL,orderby='prodotti.id DESC', 
limitby=limitby)
  File 
"/home/marcello/scripts/web2py/2/web2py/gluon/packages/dal/pydal/objects.py", 
line 2026, in select
    return adapter.select(self.query,fields,attributes)
  File 
"/home/marcello/scripts/web2py/2/web2py/gluon/packages/dal/pydal/adapters/sqlite.py",
 
line 125, in select
    return super(SQLiteAdapter, self).select(query, fields, attributes)
  File 
"/home/marcello/scripts/web2py/2/web2py/gluon/packages/dal/pydal/adapters/base.py",
 
line 1239, in select
    return self._select_aux(sql,fields,attributes)
  File 
"/home/marcello/scripts/web2py/2/web2py/gluon/packages/dal/pydal/adapters/base.py",
 
line 1220, in _select_aux
    return processor(rows,fields,self._colnames,cacheable=cacheable)
  File 
"/home/marcello/scripts/web2py/2/web2py/gluon/packages/dal/pydal/adapters/base.py",
 
line 1596, in parse
    value = self.parse_value(value,ft,blob_decode)
  File 
"/home/marcello/scripts/web2py/2/web2py/gluon/packages/dal/pydal/adapters/base.py",
 
line 1450, in parse_value
    return self.parsemap[key](value,field_type)
  File 
"/home/marcello/scripts/web2py/2/web2py/gluon/packages/dal/pydal/adapters/base.py",
 
line 1534, in parse_integer
    return long(value)
ValueError: invalid literal for long() with base 10: ''

how to face with empty values?

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