steps to reproduce: enter command group g/ s/NAME
expected: error message that says group must have a name
actual: Nothing happens (no new message or indication). If enter is pressed again, the message Command: 'group' has already been executed. is displayed.

It may be better to let the user know this is an error since it may be confusing to see that the command "has already been executed" although no new group has been added.
steps to reproduce: enter command

group g/ s/NAMEexpected: error message that says group must have a name
actual: Nothing happens (no new message or indication). If enter is pressed again, the message
Command: 'group' has already been executed.is displayed.It may be better to let the user know this is an error since it may be confusing to see that the command "has already been executed" although no new group has been added.