Calling Console Commands in Python doesn't execute

The console commands do not execute from Python if optional PlayerController parameter is not filled.

Tested in 4.20.3 (CL- 4369336), 4.21.2 (CL - 4753647), 4.22 (CL - 4902349)

1. Enable the Python and Scripting Utilities plugins
2. Create the following the Python script: 

   import unreal
   editor = unreal.EditorLevelLibrary.get_editor_world()
   console_command = 'stat fps'
   unreal.SystemLibrary.execute_console_command(editor, console_command)