Merge pull request #27058 from nextcloud/backport/27032/stable21

[stable21] Fix filesize error on log rotation, if file does not exist

lib/public/Log/RotationTrait.php

@@ -58,7 +58,7 @@ protected function rotate():string {
 	 * @since 14.0.0
 	 */
 	protected function shouldRotateBySize():bool {
-		if ((int)$this->maxSize > 0) {
+		if ((int)$this->maxSize > 0 && file_exists($this->filePath)) {
 			$filesize = @filesize($this->filePath);
 			if ($filesize >= (int)$this->maxSize) {
 				return true;