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
isHelpAvailable = b;
	}
	/**
	 * Set the message text. If the message line currently displays an error,
	 * the message is stored and will be shown after a call to clearErrorMessage
	 * <p>
	 * Shortcut for <code>setMessage(newMessage, NONE)</code>
	 * </p> 
	 * 
	 * @param newMessage the message, or <code>null</code> to clear
	 *   the message
	 */
	public void setMessage(String newMessage) {
		setMessage(newMessage, IMessageProvider.NONE);
	}
	/**
	 * Sets the message for this dialog with an indication of what type
	 * of message it is.
	 * <p>
	 * The valid message types are one of <code>NONE</code>, 
	 * <code>INFORMATION</code>, <code>WARNING</code>, or <code>ERROR</code>.
	 * </p>
	 * <p>
	 * Note that for backward compatibility, a message of type <code>ERROR</code> 
	 * is different than an error message (set using <code>setErrorMessage</code>). 
	 * An error message overrides the current message until the error message is 
	 * cleared. This method replaces the current message and does not affect the 
	 * error message.
	 * </p>
	 *