fix(Sharing): Don't break cache entry by setting path to null

see #58676

Signed-off-by: Marcel Klehr <mklehr@gmx.net>

Author: marcelklehr

apps/files_sharing/lib/Cache.php

@@ -134,7 +134,11 @@ public function moveFromCache(ICache $sourceCache, $sourcePath, $targetPath) {
 	protected function formatCacheEntry($entry, $path = null) {
 		if (is_null($path)) {
 			$path = $entry['path'] ?? '';
-			$entry['path'] = $this->getJailedPath($path);
+			$jailedPath = $this->getJailedPath($path);
+			if ($jailedPath === null) {
+				return false;
+			}
+			$entry['path'] = $jailedPath;
 		} else {
 			$entry['path'] = $path;
 		}