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
}
	/**
	 * Returns the error type. The value is defined in
	 * <code>DesignFileException</code>.
	 * 
	 * @return the error type
	 * 
	 * @see DesignFileException
	 */
	public String getType( )
	{
		return type;
	}
	/**
	 * Sets the validation ID, which identifies one specific validation.
	 * 
	 * @param validationID
	 *            the validation ID
	 */
	public void setValidationID( String validationID )
	{
		this.validationID = validationID;
	}
	/**
	 * Returns the validation ID, which identifies one specific validation.
	 * 
	 * @return the validator ID
	 */
	public String getValidationID( )
	{