code: def test_missing_csa_elem():
      # Test that we get None instead of raising an Exception when the file has
      # the PrivateCreator element for the CSA dict but not the element with the
      # actual CSA header (perhaps due to anonymization)
      dcm = deepcopy(DATA)
      csa_tag = pydicom.dataset.Tag(0x29, 0x1010)
      del dcm[csa_tag]
      hdr = csa.get_csa_header(dcm, "image")
      assert hdr is None
  
file_path: nibabel/nibabel/nicom/tests/test_csareader.py
imports: import gzip
  import sys
  from copy import deepcopy
  from os.path import join
  import numpy
  import pytest
  from ..None import csareader
  from ..None import dwiparams
  from .None import dicom_test, pydicom
  from .test_dicomwrappers import DATA, IO_DATA_PATH
label_desc: Use image node_id 7 for calling a global function with example usage: test_missing_csa_elem() without return types