[4.0] Fixed empty blog class on update

[Harmageddon]

Pull Request for Issue #32493 .

Summary of Changes

This fixes two things:

1. A PHP notice that occurs under certain circumstances (see testing instructions).
2. A || true that I used for debugging purposes in the making of [4.0] Upgrade column blog layouts to according CSS classes #31570 and accidentally committed (can be merged on code review).

Testing Instructions

1. Install a clean beta-7 or nightly version.
2. Set error reporting to development or maximum, don't make any other changes.
3. Immediately after installation, run an update using an update package.

To test the PR, please start again with a clean beta-7 or nightly and then use the update package from this PR. This PR has no effect when updating an already updated site.

Actual result BEFORE applying this Pull Request

If you use an unpatched beta-7 update package, you will see notices like in #32493.

Expected result AFTER applying this Pull Request

Using the update package from this PR (see at the bottom "Show all checks" - "Download"), the notices should no longer appear.

Documentation Changes Required

none

[jsubri]

I have tested this item ✅ successfully on 067bd89

The 2 warnings are gone after applying the patch.
Thank you

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[chmst]

I have tested this item ✅ successfully on 067bd89

Tested on win10, php8

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[richard67]

RTC

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[wilsonge]

Thanks!

And oops - really should have spotted that || true on code review