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
return element;
	}
	/**
	 * Returns the error code of the cause of the exception. The value is
	 * defined in the cause exception class.
	 * 
	 * @return error code
	 */
	public String getErrorCode( )
	{
		return errorCode;
	}
	/**
	 * Returns the name of exception with package prefix.
	 * 
	 * @return name of exception.
	 */
	public String getExceptionName( )
	{
		return exceptionName;
	}
	/**
	 * Returns line number in design file, where error is found. Note: For
	 * INVALID_XML, the line number is not accurate. Basically, the error can be
	 * found after the indicated line a bit.
	 * 
	 * @return line number in design file
	 */
	public int getLineNo( )
	{