CoefficientSplitter: fix again ReferenceGrad(Zero)#460
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* Fix split for symmetric tensors (#448) * BUG: prevent ReferenceGradient(Zero) on CoefficientSplitter (#455) * BUG: prevent ReferenceGradient(Zero) on CoefficientSplitter * test * fix for mixed dimension cells * cleanup * Pullback: remove FunctionSpace (#452) * Pullback: remove FunctionSpace * cast to int * import Zero * CoefficientSplitter: fix again ReferenceGrad(Zero) (#460)
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The first fix didn't take into account elements where the reference value shape differs from the physical value shape.