Tab completer Bug #14

Describe the bug
A clear and concise description of what the bug is.
Can't using a tab completer
Error (IG) : A tab completer cannot be assigned before the command is defined (blabla.sk line x : on tab competer for "/command":)

To Reproduce
Steps to reproduce the behavior if there are any.

1. Create a command
2. make "a on tab completer for "/command":"
3. /sk reload

Information:

• Skript version: 2.2-dev32d (1.8) / 2.3.6 (1.13.2)
• Server software: PaperSpigot
• Server version: 1.8/1.13.2/1.14....

Additional context
Add any other context about the bug here.

We use a global skript made with monitoring files
The command is defined.

Exemple for a command with tab completer doesn't work :

command /srv <number>:
	trigger:
		if arg is not set:
			send "&cVeuillez choisir le serveur de votre choix !"
			wait 40 ticks
		if arg is set:
			if this server is not "srv%arg%":
				test(player,"srv%arg%")

on tab completer for "/srv":
	add "1" to completions
	add "2" to completions
	add "3" to completions
	add "4" to completions
	add "5" to completions

(For teleport to others servers of my bungeecord)