WoltLab/WCF — pull request #1248 by Obbi89 (2013-04-26 00:18:06+00:00)
Title: Fix: Bug in package revert(from invalid package file) in WCFSetup

This is just a minor fix for the WCFSetup.
Further functional checks should be done in this code section.
As this is a bug leaving the setup in an unusable state I tried a quick fix.
It seems that you meant to do this, and added the 'isset' later on and well that caused this bug.