Added a check for the runtime mode and showed the relevant error mess…

[prjseal]

…age if

Prerequisites

• I have added steps to test this contribution in the description below

This fixes the PR raised by @marcemarc

Fixes #15758

So now with this PR, when in Production Mode, instead of showing this:

We now show this:

[github-actions]

Hi there @prjseal, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
• The level of security for this contribution is the same or improved
• The level of performance for this contribution is the same or improved
• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
• If this is a new feature, Umbraco HQ provided guidance on the implementation beforehand
• 💡 The contribution looks original and the contributor is presumably allowed to share it

Don't worry if you got something wrong. We like to think of a pull request as the start of a conversation, we're happy to provide guidance on improving your contribution.

If you realize that you might want to make some changes then you can do that by adding new commits to the branch you created for this work and pushing new commits. They should then automatically show up as updates to this pull request.

Thanks, from your friendly Umbraco GitHub bot 🤖 🙂

[mikecp]

Hello @prjseal,

Thanks for this fix, it will be indeed clearer like this 😉
Someone from the core collaborators team will have a look at it soon.

Cheers!

[busrasengul]

I tested this and it's good to merge!