fix warning on orphan page with nav buttons
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@ -1242,6 +1242,8 @@ class layout extends common
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// Trouver la clé de l'élément recherché
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$key = array_search($elementToFind, $hierarchy);
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$previousPage = null;
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$nextPage = null;
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if ($key !== false) {
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// Trouver l'élément précédent
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$previousKey = ($key > 0) ? $key - 1 : null;
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