Bug 173236 NPE is thrown when opening a design file that is created by a higher version BIRT
1. New a report, switch to xml-source view. 2. Edit the version number in line 2, from 3.2.10 to 3.2.11 and save. 3. Close the report and reopen it. The xml-source view is opened automatically. Switch to lay-out view, there's an error message window, and NPE is thrown in error-log view. When user is trying to open a design file that is created by a higher version BIRT, model will throw an exception and stop parsing the report design file. UI should 1. Prevent the NPE 2. Telling user that he is using a higher version design file that this build does not support. (Catch the exception and reflect the message in the exception to end user)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/parser/DesignParserException.java
{
	/**
	 * Comment for <code>serialVersionUID</code>
	 */
	private static final long serialVersionUID = 586491893198640178L;
	/**
	 * The design/library file was not found.
	 */
	public static final String DESIGN_EXCEPTION_FILE_NOT_FOUND = MessageConstants.DESIGN_PARSER_EXCEPTION_FILE_NOT_FOUND;
	/**
	 * The design/library file was not found.
	 */
	public static final String DESIGN_EXCEPTION_FILE_FORMAT_NOT_SUPPORT = MessageConstants.DESIGN_PARSER_EXCEPTION_FILE_FORMAT_NOT_SUPPORT;
	
	/**
	 * A custom color did not have a correct RGB value.
	 */
	public static final String DESIGN_EXCEPTION_RGB_REQUIRED = MessageConstants.DESIGN_PARSER_EXCEPTION_RGB_REQUIRED;
	/**
	 * A custom color is missing the color name.
	 */
	public static final String DESIGN_EXCEPTION_COLOR_NAME_REQUIRED = MessageConstants.DESIGN_PARSER_EXCEPTION_COLOR_NAME_REQUIRED;