[BUGFIX] Call initializeObject() after instantiating empty objects

[BUGFIX] Call initializeObject() after instantiating empty objects

If the object is initializable and has a callable initializeObject()
method run that so that initialization work will be done.

This affects model instances retrieved from the persistence.

Resolves: #67272
Resolves: #67274
Related: #66473
Releases: master, 6.2
Change-Id: I7b0278855270e8fa6ef75a424d339d072af29c54
Reviewed-on: http://review.typo3.org/39914
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Tested-by: Frans Saris <franssaris@gmail.com>
Reviewed-by: Andreas Wolf <andreas.wolf@typo3.org>
Tested-by: Andreas Wolf <andreas.wolf@typo3.org>