fix: amount is nil in GetTotalWeight + misc lint issues

[Z3rio]

Description

Upon running /giveitem 1 radio 1, you'll run into the following error.

(First print is raw item json, second print is weight & amount)

Perhaps this should be looked into more deeply, as the amount value should be defined here.
Aswell as the fact that this error might be happening at other places

Perhaps, this is caused by the radio being a unique item?

Checklist

• I have personally loaded this code into an updated qbcore project and checked all of its functionality.
• My code fits the style guidelines.
• My PR fits the contribution guidelines.

[Z3rio]

That last nil value in the lint report is fixed by my other PR.

[ChristianBDev]

I have personally tried this and cannot replicate the issue, how recent is all your qb files? If up to date is there any errors before this?

[Z3rio]

I have personally tried this and cannot replicate the issue, how recent is all your qb files? If up to date is there any errors before this?

Ran a completely fresh install a couple minutes before this.

[Z3rio]

Perhaps this issue was caused by going from the old inventory and such, to the new inventory.
Nevertheless, its an issue that did occur for me, under normal usage circumstances