GetItemLinkInfo - need help for LootDrop

[Flagrick]

Hello,

Loot drop is using

local icon, _, _, _, _ = GetItemLinkInfo( itemName )

with the event

self.control:RegisterForEvent( EVENT_LOOT_RECEIVED, function( _, ... ) self:OnItemLooted( ... )    end )

But sometimes, icon information is missing.
(In fact alway when it's a quest item that is looted)

for the moment the workaround is

    if ( not icon or icon == '' ) then
        icon = [[/esoui/art/icons/icon_missing.dds]]
    end

How could have i the icon name ?
There is an icon im my bag, so how should i do to take it with the loot event ?