orm import_data: fix incomplete fields [Bug 753277]
orm import_data: fix incomplete fields [Bug 753277]

If we try to import some csv with:
   "foo_ids","foo_ids/.id", ...
   "","", ..
where "foo_ids" is a one2many field, the algorithm would always expect
something after the "foo_ids" prefix. Hence, the first column here would
break it.

xrg/openerp-server,xrg/openerp-server