[4.4][Performance] Fix duplicated DB queries for non-existing asset

[Fedik]

Summary of Changes

Fix duplicated DB queries for non-existing asset.

Testing Instructions

Enable debug and debug Query in the debug plugin.
Login in administrator section as manager.
Open Articles list table.
Check amount of DB queries in debug panel.

Or run folowing code, in templates/atum/index.php.

for ($i = 0; $i < 100; $i++) {
    $app->getIdentity()->authorise('core.edit', 'com_content.category.1');
}

Actual result BEFORE applying this Pull Request

Around 55.

With testing code it is around 155 or more;

Expected result AFTER applying this Pull Request

Around 45

With testing code it is around 45;

Link to documentations

Please select:

• Documentation link for docs.joomla.org:
• No documentation changes for docs.joomla.org needed
• Pull Request link for manual.joomla.org:
• No documentation changes for manual.joomla.org needed

[tkuschel]

You can also fix the strange comment "// Else we have to do an extra db query to fetch it from the table fetch it from table." with this PR.

[Fedik]

done

[fgsw]

I have tested this item ✅ successfully on 892c892

Without Pull Request: 74 Queries
With Pull Request: 47 Queries

Test installed Multilang (de, en, fa)- and Blog Sample Date (14 Articles).

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[Hackwar]

I have tested this item ✅ successfully on 892c892

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[Hackwar]

RTC

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[laoneo]

Thanks!