Fix potential io errors with reading index

            // Ensure lastModified is populated in FileNode

            if (fileNode != null && currentDirectoryPath != null) {

              if (fileNode.lastModified == null) {

                String lastModified = dateTimeFormatter.format(

                    Files.getLastModifiedTime(Paths.get(fileNode.path))

                    .toInstant());

                fileNode.lastModified = lastModified;

                Path filePath = indexedPath.resolve(fileNode.path); // Ensure full path

                if (Files.exists(filePath)) {

                  fileNode.lastModified = dateTimeFormatter.format(

                      Files.getLastModifiedTime(filePath).toInstant()

                  );

                } else {

                  logger.warn("File does not exist: {}", filePath);

                }

              }

              Path directoryPath = Paths.get(currentDirectoryPath);

              Path filePath = this.indexedPath.resolve(directoryPath)

                  .resolve(Paths.get(fileNode.path));