[MERGE] avoid negative quantities in moves

bzr revid: fp@tinyerp.com-20120929104231-5cl0xi9ierhut97e

diff --cc addons/stock/stock.py
index 7fe9a8f,b552553..04071e9
--- 1/addons/stock/stock.py
--- 2/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@@ -1890,9 -1762,9 +1890,10 @@@ class stock_move(osv.osv)
          result = {
                    'product_uos_qty': 0.00
            }
 +        warning = {}
  
          if (not product_id) or (product_qty <=0.0):
+             result['product_qty'] = 0.0
              return {'value': result}
  
          product_obj = self.pool.get('product.product')
@@@ -1928,9 -1789,9 +1929,10 @@@
          result = {
                    'product_qty': 0.00
            }
 +        warning = {}
  
          if (not product_id) or (product_uos_qty <=0.0):
+             result['product_uos_qty'] = 0.0
              return {'value': result}
  
          product_obj = self.pool.get('product.product')