CE 1.9.1.0 Fatal Error

[ProxiBlue]

On CE 1.9.1.0 you get a Fatal Error:

PHP Fatal error: Call to a member function getFallbackScheme() on a non-object in /app/code/core/Mage/Core/Model/Design/Package.php on line 447

The cause is that $this->_fallback is NULL
Root cause is that Aoe_JsCssTstamp_Model_Package constructor is not calling parent constructor, which has the code to prevent null in $this->_fallback

Was there a reason for not calling the parent class constructor?