Partial revert of hosts/regions work to fix NPE with null provider.

Change-Id: I7dacad818ca9ffa2ea8085c499990c8e92644607
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java b/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
index 0cbc848..17188cb 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/UiExtensionManager.java
@@ -133,6 +133,7 @@
                 new UiView(NETWORK, "topo", "Topology", "nav_topo"),
 
                 // FIXME: leave commented out for now, while still under development
+                // (remember to also comment out inclusions in index.html)
 //                new UiView(NETWORK, "topo2", "New-Topo"),
 //                new UiView(NETWORK, "topoX", "Topo-X"),