logic in domain_sidebar which determines display of DS Data and Key Data

src/registrar/templates/domain_sidebar.html

@@ -34,7 +34,7 @@
             >
                 DNSSEC
             </a>
-            {% if domain.dnssec_enabled %}
+            {% if domain.dnssecdata is not None or request.path|startswith:url and request.path|endswith:'data' %}
             <ul class="usa-sidenav__sublist">
               <li class="usa-sidenav__item">
                 {% url 'domain-dns-dnssec-dsdata' pk=domain.id as url %}

src/registrar/templatetags/url_helpers.py

@@ -18,6 +18,11 @@ def startswith(text, starts):
         return text.startswith(starts)
     return False
 
+@register.filter("endswith")
+def endswith(text, ends):
+    if isinstance(text, str):
+        return text.endswith(ends)
+    return False
 
 @register.simple_tag
 def public_site_url(url_path):