[FIX] account move entry should be created with 0.0 value when cost price is 0.0

bzr revid: ado@tinyerp.com-20120302120144-y1vttony6y3u224l

diff --cc addons/stock/stock.py
index 072e444,f640cee..dcce510
--- 1/addons/stock/stock.py
--- 2/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@@ -2070,7 -2070,7 +2070,7 @@@ class stock_move(osv.osv)
                  context = {}
              currency_ctx = dict(context, currency_id = move.company_id.currency_id.id)
              amount_unit = move.product_id.price_get('standard_price', currency_ctx)[move.product_id.id]
-             reference_amount = amount_unit * qty or 1.0
 -            reference_amount = amount_unit * qty or 0.0
++            reference_amount = amount_unit * qty
  
          return reference_amount, reference_currency_id