fix error in PHP 8: count(): Argument #1 ($value) must be of type Countable|array, string given

[olecorre]

fix error in PHP 8: count(): Argument #1 ($value) must be of type Countable|array, string given

Questions	Answers
Branch?	develop
Description?	fix error in PHP 8: count(): Argument #1 ($value) must be of type Countable
Type?	bug fix
Category?	BO
BC breaks?	no
Deprecations?	no
How to test?	Save request SQL in BO with one jointure
UI Tests
Fixed issue or discussion?	Fixes #36083
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[prestonBot]

Hi, thanks for this contribution!

I found some issues with the Pull Request description:

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