PLF-5708: [IE8] Exception thrown when opening Sites/Navigation
PLF-5103 : UpgradeNodeTypeSpaceAccessPlugin displays wrong log

Fix description:
- Improve the log (exception management)
- Correct the upgrade behavior :
	+ Remove nodes created using the NT plf:spaceaccess
	+ Unregister the NT plf:spaceaccess
Merge commit '5e6d0801835a089ddef3069efa51404eb7a18c98' into HEAD