backport addendum-index fix

dhsn.typ

@@ -39,6 +39,7 @@
   counter(heading).update(0)
   set heading(numbering: none)
   context if query(selector(figure).after(here())).len() > 0 {
+    {
       show regex("[\n,;.]? *Quelle:.*"): none
       show ref: none
       {
@@ -47,7 +48,7 @@
       }
       outline(title: "Anhangverzeichnis", target: selector(figure).after(here()))
       pagebreak()
-
+    }
     set figure(kind: raw, supplement: "Anhang")
     counter(figure.where(kind: raw)).update(0)