fix: Handle None value for item description in customer portal invoice view (backport #43823) (#43889)

fix: Handle None value for item description in customer portal invoice view

(cherry picked from commit ceb449c75b)

Co-authored-by: ljain112 <ljain112@gmail.com>

erpnext/templates/pages/order.html

@@ -173,11 +173,11 @@
 		<div class="col-xs-8 col-sm-10">
 			{{ d.item_code }}
 			<div class="text-muted small item-description">
-				{{ html2text(d.description) | truncate(140) }}
+				{{ html2text(d.description or  "") | truncate(140) }}
 			</div>
 			<span class="text-muted mt-2 d-l-n order-qty">
 				{{ _("Qty ") }}({{ d.get_formatted("qty") }})
 			</span>
 		</div>
 	</div>
-{% endmacro %}
+{% endmacro %}