fix: hide creator if name is missing in source

Otherwise it uselessly shows up as N/A.

Works around data source issue https://github.com/ietf-ribose/relaton-data-misc/issues/3

Author: strogonoff

Diff for: main/templates/relaton/contributor.html

@@ -1,20 +1,23 @@
 {% load relaton %}
-{% if val.role %}
-  <small class="text-xs opacity-50">{{ val.role|as_list|join:", " }}</small>
-{% endif %}
 
-{% if val.organization %}
-  {% with org_name=val.organization.name|as_list|first link=val|substruct_search_link:'{"contributor": [%s]};as_list=yes;only=organization.abbreviation,organization.name' %}
-    <a class="link" href="{{ link }}">
-      {{ val.organization.abbreviation|default:org_name|default:"N/A" }}
-    </a>
-  {% endwith %}
-{% elif val.person.name %}
-  {% with link=val|substruct_search_link:'{"contributor": [%s]};as_list=yes;only=person.name.completename.content,person.name.surname.content,person.name.forename[*].content' %}
-    <a class="link" href="{{ link }}">
-      {% include "relaton/person_name.html" with val=val.person.name %}
-    </a>
-  {% endwith %}
-{% else %}
-  {% include "deflist/entry_recursivedict.html" with key_sr_only=True key=val.role|default:"contributor"|as_list|join:", " val=c %}
+{% if val.organization.abbreviation or org_name or val.person.name %}
+
+  {% if val.role %}
+    <small class="text-xs opacity-50">{{ val.role|as_list|join:", " }}</small>
+  {% endif %}
+
+  {% if val.organization.abbreviation or org_name %}
+    {% with org_name=val.organization.name|as_list|first link=val|substruct_search_link:'{"contributor": [%s]};as_list=yes;only=organization.abbreviation,organization.name' %}
+      <a class="link" href="{{ link }}">
+        {{ val.organization.abbreviation|default:org_name|default:"N/A" }}
+      </a>
+    {% endwith %}
+  {% elif val.person.name %}
+    {% with link=val|substruct_search_link:'{"contributor": [%s]};as_list=yes;only=person.name.completename.content,person.name.surname.content,person.name.forename[*].content' %}
+      <a class="link" href="{{ link }}">
+        {% include "relaton/person_name.html" with val=val.person.name %}
+      </a>
+    {% endwith %}
+  {% endif %}
+  
 {% endif %}