Correct a php notice

Correct isset() test with the good array key
// follow-up https://github.com/PrestaShop/PrestaShop/pull/1857
Merge pull request #1842 from EU-Legal/My-Changes

//FO: change position & rename hook for eu-legal
Conflicts:
	themes/default-bootstrap/product-list.tpl
	themes/default-bootstrap/product.tpl
	themes/default-bootstrap/products-comparison.tpl
	themes/default-bootstrap/shopping-cart-product-line.tpl
Merge pull request #1856 from creaweb06/patch-2

[-] CORE : notice in Product.php
// Removing comments

Conflicts:
	themes/default-bootstrap/product-list.tpl
	themes/default-bootstrap/product.tpl
	themes/default-bootstrap/products-comparison.tpl
	themes/default-bootstrap/shopping-cart-product-line.tpl
// Small fix
[*] BO : help
// small fix
Merge branch 'release' of https://github.com/PrestaShop/PrestaShop into release
[*] BO : fix hidden class for file upload safari/pc
[*] BO : fix hidden class for file upload safari/pc
// Small fix
[-] FO : Css fix
Merge branch 'release' of https://github.com/PrestaShop/PrestaShop into release
[*] BO : help
// Update help feedback form
// follow up https://github.com/PrestaShop/PrestaShop/pull/1860
[*] BO : added admin.js to help popup.
//Submodule update
[-] CORE : Fix #PSCSX-2256, add ui.spinner in media dependancies