leapp preupgrade failed with a python traceback KeyError: 'leapp'

Issue

• leapp preupgrade failed with the following error.

  # leapp preupgrade 
    Traceback (most recent call last):
        File "/usr/bin/leapp", line 9, in <module>
          load_entry_point('leapp==0.13.0', 'console_scripts', 'leapp')()
        File "/usr/lib/python2.7/site-packages/leapp/cli/__init__.py", line 37, in main
          cli.command.execute('leapp version {}'.format(VERSION))
        File "/usr/lib/python2.7/site-packages/leapp/utils/clicmd.py", line 105, in execute
          self._sub_commands[cmdname].parser.error(leftover)
    KeyError: 'leapp'
  

• leapp preupgrade failed with the following error on RHEL 8.6.

  # leapp preupgrade
    Traceback (most recent call last):
        File "/usr/bin/leapp", line 11, in <module>
          load_entry_point('leapp==0.14.0', 'console_scripts', 'leapp')()
        File "/usr/lib/python3.6/site-packages/leapp/cli/__init__.py", line 37, in main
          cli.command.execute('leapp version {}'.format(VERSION))
        File "/usr/lib/python3.6/site-packages/leapp/utils/clicmd.py", line 105, in execute
          self._sub_commands[cmdname].parser.error(leftover)
    KeyError: 'leapp'