fix support for waiting list pages

directory.js

@@ -127,14 +127,26 @@ function generateTrombi() {
   trombi.classList.add("kf-trombi_enhanced");
   const form = $G("idTNListe");
 
-  const table_body = $G("idTNVWTable").tBodies[0];
+  const table = $G("idTNVWTable");
+  const table_head_first_row = table.tHead.rows[0];
+  const table_body = table.tBodies[0];
+
+  // check if the page is a waiting list (Warteliste)
+  // in which case columns are shifted because of the 'Pos'
+  // column.
+
+  const isWaitingList = (table_head_first_row.children[1].textContent.trim() == "Pos");
+
+  const lastnameOffset = 1 + isWaitingList;
+  const fistnameOffset = 2 + isWaitingList;
+  const studentFileLinkOffset = 1 - isWaitingList;
 
   const student_list = [];
   for (let row of table_body.children) {
     student_list.push({
-      lastname: row.children[1].textContent,
-      firstname: row.children[2].textContent,
-      ids: extractIDs(row.children[1].children[1].href)
+      lastname: row.children[lastnameOffset].textContent,
+      firstname: row.children[fistnameOffset].textContent,
+      ids: extractIDs(row.children[lastnameOffset].children[studentFileLinkOffset].href)
     })
   };