FE_PolyTensor: Only request dof_sign_change if necessary #15963
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This PR fixes an issue I saw with
FE_RaviartThomasNodalon another check (PR to be opened soon):FEValuesrequesting only mapping information but initialized with elements derived fromFE_PolyTensorwould previously run into an assertion on unstructured 2d meshes. The fix is to only use the helper function in the case that uses thedof_sign_changefurther down infill_fe_values.