[FIX] ir_values: try to evaluate the given expression before saving it in pickle form (opw 607398)

The value_unpickled given by xml data is usualy already evaluated but when it is given by the web client, a str is recieved by the method (as the field is a text field). In the later case, we need to evaluate the field before storing to be correctly evaluated as a default value.

bzr revid: mat@openerp.com-20140509130412-ki211x7qdccdnv5w

openerp/addons/base/ir/ir_values.py

@@ -22,6 +22,7 @@ import pickle
 
 from openerp.osv import osv, fields
 from openerp.osv.orm import except_orm
+from openerp.tools.safe_eval import safe_eval as eval
 
 EXCLUDED_FIELDS = set((
     'report_sxw_content', 'report_rml_content', 'report_sxw', 'report_rml',
@@ -121,7 +122,13 @@ class ir_values(osv.osv):
         record = self.browse(cursor, user, id, context=context)
         if record.key == 'default':
             # default values are pickled on the fly
-            value = pickle.dumps(value)
+            if isinstance(value, (str, unicode)):
+                try:
+                    value = pickle.dumps(eval(value))
+                except Exception:
+                    value = pickle.dumps(value)
+            else:
+                value = pickle.dumps(value)
         self.write(cursor, user, id, {name[:-9]: value}, context=ctx)
 
     def onchange_object_id(self, cr, uid, ids, object_id, context=None):