Check the input type in neve_get_default_meta_value function

[cristian-ungureanu]

Summary

I've changed the function to make sure that json_decode will get the proper parameter type. This should fix user's error and prevent similar things from happening.

Note: I could not replicate the issue or see the HS ticket and I saw that the user switched to Hestia. Those changes should prevent the error from happening but I could not properly test if it solves the problem since I don't have access to the user's site.

Will affect visual aspect of the product

NO

Test instructions

• Not much to test here as I wasn't able to replicate the issue, just a general check that post-meta defaults are working fine.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes Codeinwp/neve-pro-addon#2544.

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[irinelenache]

@cristian-ungureanu Tested and everything's working fine regarding this PR 🚀

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🎉 This PR is included in version 3.6.7 🎉

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