Description of problem:
When the $SUMMARY is tried, an NPE occurs.
Steps to Reproduce:
1. In the left nav, open some subcategory node
2. Click on one of its children so that its detail appears in the main pane and the child is selected in the tree.
3. Try to close the subcategory node in the tree.
The subcategory node is closed, automatically selected and its content appears in the main pane.
Preliminary fixed by commit 13d96b3
For now, nothing happens when you try to close a subcategory (i.e. the subcategory remains open and its child in focus). This is going to change to the expected behaviour once the content page is implemented for subcategories.
fixed in gwt
tested in gwt.
Bulk closing of old issues that are in VERIFIED state.