vtkPVFileInformation: more NULL checking on Apple

Change-Id: I66d049699d19fcaf34ea3c851e9f165034717980
vtkPVFileInformation: use NewHandle for AliasHandle alloc

Follows the examples for examples doing similar things from Apple's site
and malloc seems to crash in some cases.

Change-Id: Ie8b1659c543b6bbcca02edcff6d8c65eec75836e
Merge topic 'cfapi-null-logic' into next

08491158 vtkPVFileInformation: use NewHandle for AliasHandle alloc
27bb71f0 vtkPVFileInformation: more NULL checking on Apple