yiisoft/yii — pull request #2163 by odevyatkov (2013-03-03 19:27:38+00:00)
Title: add previous exception to base yii exception classes as param

Problem: CException Yii base exception class allows previous exception as param, and CDbException or CHttpException do not.
Fix: add previous exception to base yii exception class constructors as param and pass this param to parent (CException) construct method.