Get MetaData even if SetInputData is used.
Get MetaData even if SetInputData is used.

The vtkTrivialProducer::FillOutputDataInformationMethod is hard-coded
to only copy certain keys to the pipeline.  Since it cannot copy the
meta data, the RequestInformation method needs to do a lot of extra work.

dgobbi/vtk-dicom,dgobbi/vtk-dicom,dgobbi/vtk-dicom,hendradarwin/vtk-dicom,hendradarwin/vtk-dicom,hendradarwin/vtk-dicom