[FIX] m2m command in import

command helpers create a single command, still need the list around commands

and the tests would have caught it, if I'd run them...

bzr revid: xmo@openerp.com-20121009070934-7i1hxuzumdu8x1jy

openerp/addons/base/ir/ir_fields.py

@@ -297,7 +297,7 @@ class ir_fields_converter(orm.Model):
                 cr, uid, model, column, subfield, reference, context=context)
             ids.append(id)
             warnings.extend(ws)
-        return REPLACE_WITH(ids), warnings
+        return [REPLACE_WITH(ids)], warnings
 
     def _str_to_one2many(self, cr, uid, model, column, records, context=None):
         commands = []