account test module fails when tries to print tranlations with '_'

[Raúl Muñoz]

With the base module account_test enabled:
When you try to execute a new report from Reporting>Accounting Tests < if there is any data to show > it'll crash with an unrelated error:

OpenERP Client error
SyntaxError: JSON.parse: unexpected end of data
https://myserver/web/webclient/js?db=plusplus:3069

The problem is in the file account_test/report/account_test_report.py line 67 where it tries to execute the following:

exec code_exec in localdict
having
        localdict = {
            'cr': self.cr,
            'uid': self.uid,
            'reconciled_inv': reconciled_inv, #specific function used in different tests
            'result': None, #used to store the result of the test
            'column_order': None}

Thus adding '_' : _ to the dict it now knows how to handle tranlations from the report and no longer crashes.

Version affected openerp 7.0