code: def test_viewer_delete_without_table(self):
      table = Table({"a": [1, 2, 3]})
      viewer = PerspectiveViewer(
          plugin="X Bar", filter=[["a", "==", 2]]
      )
      viewer.load(table)
      assert viewer.filter == [["a", "==", 2]]
      viewer.delete(delete_table=False)
      assert viewer.table_name is not None
      assert viewer.table is not None
      assert viewer.filter == []
  
imports: import numpy
  import pandas
  from perspective import PerspectiveViewer, Table
label_desc: Use image node_id 22 for calling the TestViewer obj's underlying member method code with example usage: obj.test_viewer_delete_without_table() without return types