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/api/ErrorDetail.java
if ( lineNo == 0 )
		{
			if ( element == null )
				return 1;
			Module root = element.getRoot( );
			if ( root != null )
				return root.getLineNo( element );
			else
				return 1;
		}
		else
			return lineNo;
	}
	/**
	 * Returns the error message.
	 * 
	 * @return the localized error message as a string
	 */
	public String getMessage( )
	{
		return message;
	}
	/**
	 * Returns the tag name that causes error.
	 * 
	 * @return the tag name
	 */
	public String getTagName( )
	{
		return tagName;