[BUG] Calling GetItemStats on items with stats from auras prints a warning message

[raethkcj]

1. Current Behavior

1.1. Description

Many items in Classic have stats provided through a passive aura attached to the item through ItemEffect, rather than having the stats on the item itself. When the API function GetItemStats is called on one of these items, a warning message is printed in the console.

1.2. How to Reproduce

1. /console enable
2. Press `, the default keybinding to open the console, observe current messages, then close again
3. /dump GetItemStats("\124cff0070dd\124Hitem:12784::::::::60:::::\124h[Arcanite Reaper]\124h\124r")
4. Open the console again and observe

CGast - CGItemStatsSummary::ParseSpellRec is being called for spellID: 15816, effect aura: 99, which is wrong
CGast - CGItemStatsSummary::ParseSpellRec is being called for spellID: 15816, effect aura: 124, which is wrong

1.3 Source Material

2. Expected Behavior

2.1. Description

Calling GetItemStats on a valid item shouldn't result in warning messages.