[MC-80101] '/worldborder warning time' or '/worldborder warning distance' without the number param causes an "unknown error"

To reproduce, run either of these commands: /worldborder warning time or /worldborder warning distance.

What I expected: running that command would give help info like all of the other commands.

What actually happened: "An unknown error occurred while attempting to perform this command" is printed to chat. The game log also prints "Couldn't process command: 'worldborder warning time'" for the server thread, but no stacktrace (on neither the integrated nor a dedicated vanilla server).

That causes these 2 strings to go unused as well.

Linked issues

duplicates 1

MC-69072 "/worldborder warning distance/time" throws an error when used without arguments Resolved

Comments 2

Dlawso the Really Lucky Rabbit 2015-05-05T01:42:31Z

Dupe of MC-69072. The "sizeInBlocks" and "timeInSeconds" parameters are required for the command to function properly.

pokechu22 2015-05-05T01:48:24Z

That's a correct dupe (though searching didn't find it). Though I find it odd that no stacktrace was put into the chat.

Though it still is incorrect for it to display the "An unknown error occurred while performing this command" message; it should give the (already existing) help text. So the other bug is still a real bug.