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java.lang.NullPointerException: 	at org.springframework.ide.eclipse.webflow.ui.navigator.WebflowNavigatorContentProvider.hasChildren(WebflowNavigatorContentProvider.java:117)	at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.hasChildren(SafeDelegateTreeContentProvider.java:107)	at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.hasChildren(SafeDelegateTreeContentProvider.java:292)	at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.hasChildren(NavigatorContentServiceContentProvider.java:654)	at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:1976)	at org.eclipse.jface.viewers.TreeViewer.isExpandable(TreeViewer.java:449)	at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:2006)	at org.eclipse.jface.viewers.AbstractTreeViewer.updatePlus(AbstractTreeViewer.java:2619)	at org.eclipse.jface.viewers.TreeViewer.updatePlus(TreeViewer.java:693)	at org.eclipse.jface.viewers.AbstractTreeViewer.updateChildren(AbstractTreeViewer.java:2554)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1788)	at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:561)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1795)	at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:561)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1763)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1719)	at org.eclipse.ui.navigator.CommonViewer.internalRefresh(CommonViewer.java:454)