worldborder damage command not giving any feedback with invalid argument

The bug

When using the /worldborder damage command with any argument except the allowed ones creates no command feedback.

How to reproduce

Use the following command

/worldborder damage invalidArgument

→ No command feedback is displayed in the chat

The reason

The following is based on decompiled version of Minecraft 1.9 using MCP 9.24 beta. All method and class names are the names used in the decompiled version.

The reason why this happens is because the method net.minecraft.command.CommandWorldBorder.execute(MinecraftServer, ICommandSender, String[]) only tests if the given argument is "buffer" or "amount". It should however throw a WrongUsageException if this is not the case.