Fix : removing DescriptionTag if description not provided (#460)

* chore: removing DescriptionTag if description not provided

* test undefined

---------

Co-authored-by: Dylan Decrulle <81740200+ddecrulle@users.noreply.github.com>

Author: Destinyyyy

src/Alert.tsx

@@ -156,7 +156,9 @@ export const Alert = memo(
                         {title}
                     </HtmlTitleTag>
                 )}
-                <DescriptionTag className={classes.description}>{description}</DescriptionTag>
+                {description !== undefined && (
+                    <DescriptionTag className={classes.description}>{description}</DescriptionTag>
+                )}
                 {isClosableByUser && (
                     <button
                         ref={setButtonElement}