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Revert commit c3a86fd5 and guard against reading NULL data arrays.

T.J. Corona requested to merge tjcorona/vtk:xml-reader-duplicate-name-revert into master

In vtkXMLDataReader, commit c3a86fd5 added an exit-with-error when multiple data arrays in point or cell data had the same name. This caused issues with reading xml input data that had data arrays that had the same name, but differed by timestep (see Issue Issue #15723 (closed)). This commit reverts that change, and instead guards against reading vtkDataArrays that are uninitialized (which also fixes the error reported in Issue #15525 (closed)).

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