code: def test_set_active_multi_multi(multiblock_poly):
      multi_multi = MultiBlock([multiblock_poly, multiblock_poly])
      with pytest.raises(KeyError, match="missing from all"):
          multi_multi.set_active_scalars(
              "does-not-exist", allow_missing=True
          )
  
      multi_multi.set_active_scalars("multi-comp", allow_missing=True)
  
imports: import pathlib
  import platform
  import weakref
  import numpy
  import pytest
  import vtk
  import pyvista
  from pyvista import ImageData, MultiBlock, PolyData, RectilinearGrid, StructuredGrid, examples
label_desc: Use image node_id 37 for calling a global function with example usage: test_set_active_multi_multi(multiblock_poly) without return types