MultiCurrency Check - if a value is set

[anastas10s-afk]

Changes proposed in this Pull Request

Belated follow-up to 7193852-zen.
Created this PR for pinging the dev team, in case such a code addition would be prudent.

• Cannot reproduce the error, when testing with a test site of mine
• Logs are clean; nothing reported there
• Does not break my test site, either, with or without multi-currency option enabled
• Tested with versions 6.6.2, and 7.2.0

https://snipboard.io/bZeWm6.jpg

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• Covered with tests (or have a good reason not to test in description ☝️)
• Tested on mobile (or does not apply)

Post merge

• Link to testing instructions from release testing doc following these instructions : Add link here / 'QA Testing Not Applicable'
• Add or update critical flows and testing instructions for critical flows, if applicable.
• Add what's changed (description, screenshot, demo videos etc.) to the release announcement post, if applicable.