Update product-jsonld.tpl

[gregmag]

product.condition is an array. Here is product.condition.type the right value to use

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Description?	Please be specific when describing this change. What did you change? Why?
Type?	bug fix / improvement / new feature / refactor
BC breaks?	yes / no
Deprecations?	yes / no
Fixed ticket?	Fixes #{issue URL here}, Fixes #{another issue URL here}
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How to test?	Indicate how to verify that this change works as expected.

[ps-jarvis]

Hello @gregmag!

This is your first pull request on classic-theme repository of the PrestaShop project.

Thank you, and welcome to this Open Source community!

[Hlavtox]

You are absolutely right, but we can simplify it more.

Just use this:

{if !empty($product.condition)}"itemCondition": "{$product.condition.schema_url}",{/if}