docstr: Issue an empty command then exit.
docstr_tok: ["Issue","an","empty","command","then","exit","."]
code: def testRunUIEmptyCommand(self):
      """Issue an empty command then exit."""
  
      ui = MockReadlineUI(command_sequence=["", "exit"])
      ui.run_ui()
      self.assertEqual(1, len(ui.observers["screen_outputs"]))
  
imports: import os
  import argparse
  import tempfile
  from tensorflow.python.debug.cli import cli_config
  from tensorflow.python.debug.cli import debugger_cli_common
  from tensorflow.python.debug.cli import readline_ui
  from tensorflow.python.debug.cli import ui_factory
  from tensorflow.python.framework import test_util
  from tensorflow.python.lib.io import file_io
  from tensorflow.python.platform import gfile
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 8 for calling the CursesTest obj's underlying member method code with example usage: obj.testRunUIEmptyCommand() without return types