Issue #3560306: Resolved all warning errors in the CustomSearchBlock.php by...

Dmytro Kurdelchukrequested to merge
issue/custom_search-3560306:3560306-resolving-all-error into 8.x-1.x

Issue #3560306: Resolved all warning errors in the CustomSearchBlock.php by adding defencive code and small fixes.

Closes #3560306

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