Fix an error for form usage, when dealing with nested entries

src/templates/forms/_panes/usage.html

@@ -8,7 +8,7 @@
     {% set render = not showDrafts and element.isDraft() ? false : render %}
     {% set render = not showRevisions and element.isRevision() ? false : render %}
 
-    {% if element is instance of('craft\\elements\\Entry') or element is instance of('benf\\neo\\elements\\Block') %}
+    {% if (element is instance of('craft\\elements\\Entry') or element is instance of('benf\\neo\\elements\\Block')) and element.ownerId %}
         {# Add a check here to ensure there's a valid owner (`getOwner()` will throw a hard-error) #}
         {% set owner = craft.app.getElements().getElementById(element.ownerId, className(element), element.siteId) %}
         {% set ownerField = craft.app.getFields().getFieldById(element.fieldId) %}