Bug 48364 PreferenceDialog can reopen empty
20031209 When you close the Preferences dialog with an entry other than the default selected you will get an empty entry in the dialog when you reopen STEPS 1) Open the preferences dialog 2) Select the Appearances page 3) Close the dialog 4) Reopen - Workbench will be selected and the contents will be empty
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
* supplied value.
	 * @param nodeId the id to search for.
	 * @return <code>IPreferenceNode</code> or <code>null</code> if not found.
	 */
	private IPreferenceNode findNodeMatching(String nodeId) {
		List nodes = preferenceManager.getElements(PreferenceManager.POST_ORDER);
		for (Iterator i = nodes.iterator(); i.hasNext();) {
			IPreferenceNode node = (IPreferenceNode) i.next();
			if (node.getId().equals(nodeId))
				return node;
		}
		return null;
	}
	/**
	 * Returns the preference mananger used by this preference dialog.
	 *
	 * @return the preference mananger
	 */
	public PreferenceManager getPreferenceManager() {
		return preferenceManager;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.preference.IPreferencePageContainer#getPreferenceStore()
	 */
	public IPreferenceStore getPreferenceStore() {
		return preferenceStore;
	}
	/**
	 * Get the name of the selected item preference
	 */