version: 24.2
When I use treeNodeAdapter.addNode() to add a child node to a non-leaf parent, it works fine.
However, when I use the same code to add a child node to a leaf node, it throws an error Uncaught TypeError: can't access property "push", pParent.children is undefined.
To further check, I find that the leaf nodes do no have the children array property, and the source code does not check it before pushing a new node to children array.
To reproduce the issue, please refer to the following steps.
1. First of all, create a tree region and name it as “TREE”.
2. Select a parent node, and run following code.
apex.region("TREE").call("getNodeAdapter").addNode(apex.region("TREE").call("getSelectedNodes")[0],2,"Here is a new item2",null,()=>apex.region("R_TREE").call("refresh"))
Works fine!
3. Select a child node, and run above code again.
