The PackageStates.php file migration from LocalConfiguration.php happens
transparently upon the first call of the install tool. If the file
LocalConfiguration.php is not available yet, like during installation
from a blank package this step fails.

This patch introduces some more checks that check if typo3conf and
LocalConfiguration.php are present before the migration of PackageStates
kicks in.

Resolves: #52847
Releases: 6.2
Change-Id: I5dede4123ad1474c0493c85d96350fd6cfdc04c4
Reviewed-on: https://review.typo3.org/24793
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Thomas Maroschik
Tested-by: Thomas Maroschik