MultiComponent mapping volume rendering force coloring with a non existent point data

Steps to reproduces:

Run ParaView
Open a.vtk, Apply,
Color by [CellData] Scalars
Select volume rendering
Check the "Multi component mapping" checkbox
A non-existent [PointData] Scalars array become selected for coloring
Selecting [CellData] Scalars again seems to fix the issue

@michael.migliore : FYI

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