MRP report product.price requires currency symbol

In MRP module report report.product.price:

there are extensive use of lines of type :
<col t='yes'>""" + rml_obj.formatLang(total_strd, digits=purchase_price_digits) + ' ' + company_currency.symbol + """</col>

which naturally crash the report if the company's currency has no symbol specified (it is not mandatory):

[2011-11-30 19:30:54,904][JFM_local] ERROR:web-services:[07]: File "/home/xafer/openerp/tahiti/server/bin/addons/mrp/report/price.py", line 153, in create_xml
[2011-11-30 19:30:54,904][JFM_local] ERROR:web-services:[08]: <col t='yes'>""" + rml_obj.formatLang(total_strd, digits=purchase_price_digits) + ' ' + company_currency.symbol or company_currency.name + """</col>
[2011-11-30 19:30:54,904][JFM_local] ERROR:web-services:[09]: TypeError: coercing to Unicode: need string or buffer, bool found

Replacing all 'company_currency.symbol' by '(company_currency.symbol or company_currency.name)' does the trick