Merge topic 'vtkply_bugfix'

22d30f45 Fix brackets
38c78077 Prevent invalid free when props pointer is uninitialized

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Mathieu Westphal (Kitware) <mathieu.westphal@kitware.com>
Merge-request: !11961