fix(android): prevent error while using SAF paths

Author: farfromrefug

packages/core/file-system/file-system-access.android.ts

@@ -1468,7 +1468,7 @@ export class FileSystemAccess29 extends FileSystemAccess {
 	} {
 		if (isContentUri(path)) {
 			const documentFile = getOrSetFolderHelper(path).getOrCreateFile(fileName, create);
-			const subPath = documentFile.getUri().toString();
+			const subPath = documentFile?.getUri()?.toString();
 			return documentFile
 				? {
 						path: subPath,