[nobug] avoid possible NPE from subclasses
diff --git a/bundles/org.eclipse.wst.xml.ui/src/org/eclipse/wst/xml/ui/views/contentoutline/XMLContentOutlineConfiguration.java b/bundles/org.eclipse.wst.xml.ui/src/org/eclipse/wst/xml/ui/views/contentoutline/XMLContentOutlineConfiguration.java
index 9359ae9..ef06d1d 100644
--- a/bundles/org.eclipse.wst.xml.ui/src/org/eclipse/wst/xml/ui/views/contentoutline/XMLContentOutlineConfiguration.java
+++ b/bundles/org.eclipse.wst.xml.ui/src/org/eclipse/wst/xml/ui/views/contentoutline/XMLContentOutlineConfiguration.java
@@ -90,7 +90,9 @@
 			if (fActionManager == null) {
 				fActionManager = createNodeActionManager(fTreeViewer);
 			}
-			fActionManager.fillContextMenu(manager, fTreeViewer.getSelection());
+			if (fActionManager != null) {
+				fActionManager.fillContextMenu(manager, fTreeViewer.getSelection());
+			}
 		}
 
 		/*