message: build(aio): don't show constructor detail if there is none
diff: {% block additional %}{% endblock %}
  {% include "includes/description.html" %}
  {$ memberHelpers.renderMemberDetails(doc.statics, 'static-members', 'static-member', 'Static Members') $}
  -{$ memberHelpers.renderMemberDetails([doc.constructorDoc], 'constructors', 'constructor', 'Constructor') $}
  +{% if doc.constructorDoc %}{$ memberHelpers.renderMemberDetails([doc.constructorDoc], 'constructors', 'constructor', 'Constructor') $}{% endif %}
  {$ memberHelpers.renderMemberDetails(doc.members, 'instance-members', 'instance-member', 'Members') $}
  {% include "includes/annotations.html" %}
  