Fix condition to update leaves

index.html

@@ -498,12 +498,13 @@
          knowledgeItem.setAttribute("class", "knowledge-item");
          let knowledgeId = activeLeaf.id.replace("path", "knowledge");
          leafData = document.getElementById(knowledgeId);
-         if(!leafData) {
+         if(leafData) {
+             leafData.innerHTML = leafdata.leaftext;
+         } else {
              knowledgeItem.setAttribute("id", knowledgeId);
              knowledgeItem.innerHTML = leafdata.leaftext;
              document.getElementById("knowledge").appendChild(knowledgeItem);
          }
-         leafData.innerHTML = leafdata.leaftext;
      });
 
      function popupLeaf() {