Fix throwing NullPointerException when getting a fileName with a query param.

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/impl/FileDownloaderServiceProvider.java

@@ -135,14 +135,12 @@ public class FileDownloaderServiceProvider {
          * Extracts file name segments (name and extension) by parsing the given URL.
          * <p>
          * This method handles two types of URL formats:
-         * <ul>
-         *   <li>If the URL includes a query parameter in the format `?fileName=`, the file name
-         *       is extracted from this query parameter (ex: when referencing an existing
-         *       screenshot or icon from the main release)</li>
-         *   <li>If the URL does not have the `fileName` query parameter, the method attempts to
-         *       extract the file name from the URL path. (ex: this applies to cases where new files are
-         *       uploaded, and only a path-based URL is provided)</li>
-         * </ul>
+         * - If the URL includes a query parameter in the format `?fileName=`, the file name
+         *   is extracted from this query parameter (ex: when referencing an existing
+         *   screenshot or icon from the main release)
+         * - If the URL does not have the `fileName` query parameter, the method attempts to
+         *   extract the file name from the URL path. (ex: this applies to cases where new files are
+         *   uploaded, and only a path-based URL is provided)
          * After locating the file name (from either the query parameter or path), the method
          * splits the name into segments based on the last dot (`.`), returning the base name and
          * extension as a two-element array. If file name cannot be extracted, `null` is returned.