Revert 3dec090 "[FIX] ir_values: fallback when no condition"

An ir.value without condition should not match when searching with a condition.
When a field with change_default on it is modified, the method get_defaults is called with the new value. This means that manually modifying a field with this trigger would put back the default value (opw 611193).
Merge branch '7.0' of https://github.com/odoo/odoo into 7.0-win32