Merge pull request #2283 from nextcloud/backport/2279/stable28

[stable28] Just because an array key doesn't imply the value at that key isn't null.

Author: artonge

lib/Listener/OriginalDateTimeMetadataProvider.php

@@ -93,7 +93,7 @@ public function handle(Event $event): void {
 		$metadata = $event->getMetadata();
 
 		// Try to use EXIF data.
-		if ($metadata->hasKey('photos-exif') && array_key_exists('DateTimeOriginal', $metadata->getArray('photos-exif'))) {
+		if ($metadata->hasKey('photos-exif') && !empty($metadata->getArray('photos-exif')['DateTimeOriginal'])) {
 			$rawDateTimeOriginal = $metadata->getArray('photos-exif')['DateTimeOriginal'];
 			$timestampOriginal = $this->dateToTimestamp("Y:m:d G:i:s", $rawDateTimeOriginal, $node);
 			if ($timestampOriginal !== false) {