[FIX] ir.attachment: no crash on missing file with bin_size=True
[FIX] ir.attachment: no crash on missing file with bin_size=True

When bin_size=True is passed, `os.path.getsize()` raises an OSError
rather than IOError when the file cannot be found.

storm-computers/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,ygol/odoo,storm-computers/odoo,laslabs/odoo,microcom/odoo,sysadminmatmoz/OCB,stephen144/odoo,storm-computers/odoo,microcom/odoo,stephen144/odoo,bplancher/odoo,dfang/odoo,storm-computers/odoo,optima-ict/odoo,storm-computers/odoo,laslabs/odoo,stephen144/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,dfang/odoo,bplancher/odoo,laslabs/odoo,ygol/odoo,ygol/odoo,Elico-Corp/odoo_OCB,microcom/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,laslabs/odoo,dfang/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo,optima-ict/odoo,Elico-Corp/odoo_OCB,ygol/odoo,dfang/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,optima-ict/odoo,dfang/odoo,stephen144/odoo,optima-ict/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,stephen144/odoo,ygol/odoo,optima-ict/odoo,bplancher/odoo,hip-odoo/odoo,bplancher/odoo,laslabs/odoo,stephen144/odoo,microcom/odoo,sysadminmatmoz/OCB,sysadminmatmoz/OCB,optima-ict/odoo,microcom/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,ygol/odoo,bplancher/odoo,sysadminmatmoz/OCB,bplancher/odoo,microcom/odoo