8278247: KeyStoreSpi::engineGetAttributes does not throws KeyStoreException

Reviewed-by: mullan

Author: wangweij

src/java.base/share/classes/java/security/KeyStoreSpi.java

@@ -465,9 +465,6 @@ void engineLoad(InputStream stream, KeyStore.LoadStoreParameter param)
      *      {@link #engineGetEntry} and can be retrieved by calling
      *      the {@link Entry#getAttributes} method.
      *
-     * @throws KeyStoreException if the keystore has not been initialized
-     * (loaded).
-     *
      * @since 18
      */
     public Set<Entry.Attribute> engineGetAttributes(String alias) {