[7.0]Partner balance webkit error using the 'Opening Only' filter

[Peter Langenberg]

filter : take verything

filter by : opening only

  File "account_financial_report_webkit/report/common_partner_balance_reports.py", line 116, in _get_partners_totals_account
Error :

---------------------------------

syntax error at or near ")"
LINE 5: ...e = 'valid' AND account_move_line.period_id in () AND acco...
^

(<class 'psycopg2.ProgrammingError'>, ProgrammingError('syntax error at or near ")"\nLINE 5: ...e = \'valid\' AND account_move_line.period_id in () AND acco...\n ^\n',), <traceback object at 0x7f002c25bdd0>)