[MERGE][IMP] More explicit error message in res_currency

bzr revid: rim@openerp.com-20140423074037-igw9je00rcfgfzia

openerp/addons/base/res/res_currency.py

@@ -58,7 +58,8 @@ class res_currency(osv.osv):
             elif not raise_on_no_rate:
                 res[id] = 0
             else:
-                raise osv.except_osv(_('Error!'),_("No currency rate associated for currency %d for the given period" % (id)))
+                currency = self.browse(cr, uid, id, context=context)
+                raise osv.except_osv(_('Error!'),_("No currency rate associated for currency '%s' for the given period" % (currency.name)))
         return res
 
     _name = "res.currency"