[account] Report: Print Taxes Report show errors

Use Case:
  - Create a new DB (WITHOUT demo data)
  - Select "Accounting only profile"
  - Configurate Database
  - Choose a Chart of Account
  - Go to: Financial Managment / Reporting / Taxes Reports
  - Choose: Print Taxes Report (use default value)

Report are displayed (no exception), but server console show thoses exceptions (full log available as attachment)

[Mon Jan 12 2009 12:04:21] ERROR:report:[01]: report account.vat.declaration:
[Mon Jan 12 2009 12:04:21] ERROR:report:[02]: Traceback (most recent call last):
[Mon Jan 12 2009 12:04:21] ERROR:report:[03]: File "/home/dex/Work/dex4/server/bin/report/report_sxw.py", line 415, in _eval
[Mon Jan 12 2009 12:04:21] ERROR:report:[04]: res = eval(expr, self.localcontext)
[Mon Jan 12 2009 12:04:21] ERROR:report:[05]: File "<string>", line 1, in <module>
[Mon Jan 12 2009 12:04:21] ERROR:report:[06]: File "/home/dex/w/dex4/addons/account/report/tax_report.py", line 62, in _get_lines
[Mon Jan 12 2009 12:04:21] ERROR:report:[07]: res = self._add_codes(based_on,res,period_list)
[Mon Jan 12 2009 12:04:21] ERROR:report:[08]: File "/home/dex/w/dex4/addons/account/report/tax_report.py", line 171, in _add_codes
[Mon Jan 12 2009 12:04:21] ERROR:report:[09]: code.sum_period = sum_tax_add
[Mon Jan 12 2009 12:04:21] ERROR:report:[10]: *UnboundLocalError: local variable 'code' referenced before assignment*
[Mon Jan 12 2009 12:04:21] ERROR:report:[11]:
[Mon Jan 12 2009 12:04:21] ERROR:report:[12]: local variable 'code' referenced before assignment
[Mon Jan 12 2009 12:04:21] ERROR:report:[13]: expr: repeatIn(get_lines(data['form']['based_on'],data['form']['periods'],data['form']['company_id']), 'o')
[Mon Jan 12 2009 12:04:21] ERROR:report:[01]: report account.vat.declaration:
[Mon Jan 12 2009 12:04:21] ERROR:report:[02]: Traceback (most recent call last):
[Mon Jan 12 2009 12:04:21] ERROR:report:[03]: File "/home/dex/Work/dex4/server/bin/report/report_sxw.py", line 415, in _eval
[Mon Jan 12 2009 12:04:21] ERROR:report:[04]: res = eval(expr, self.localcontext)
[Mon Jan 12 2009 12:04:21] ERROR:report:[05]: File "<string>", line 1, in <module>
[Mon Jan 12 2009 12:04:21] ERROR:report:[06]: *NameError: name 'o' is not defined*

  affects openobject-addons

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