Check if itemString or itemLink

[Marsgames]

Hey, I would like to know if there’s a way to check if I have an itemLink or an itemString.

I’m using

GetInventoryItemLink("player", GetInventorySlotInfo("HeadSlot"))

to get all my equipped items, but because of the item is not always cached, sometimes I get something like this : "[Tome de la raison déclinante]" that is an itemLink, but sometimes I only get "[]". At first I thought it was nothing but after some research, I found that it was an itemString, and if I try to parse it with

local aze = GetInventoryItemLink("player",GetInventorySlotInfo("Trinket0Slot"))
local itemString = select(3, strfind(aze, "|H(.+)|h"))
print(itemString)

It returns "item:147019::::::::110:265::3:3:3561:1492:3528:::[]"

So, as I want to have an itemLink, is there a way to check if it returns an itemLink or an itemString, like that I can wait for ITEM_INFO_RECEIVED to add the itemLink in my table.