Bug 246105 [Dialogs] Title and description not layed out properly when title image is null
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/TitleAreaDialog.java
if (message == null) 
				
				message = ""; 
			updateMessage(message);
			messageImageLabel.setImage(messageImage);
			setImageLabelVisible(messageImage != null);
		} else {
			
			
			String displayedErrorMessage = " " + errorMessage; 
			updateMessage(displayedErrorMessage);
			if (!showingError) {
				
				showingError = true;
				messageImageLabel.setImage(JFaceResources
						.getImage(DLG_IMG_TITLE_ERROR));
				setImageLabelVisible(true);
			}
		}
		layoutForNewMessage();
	}
	/**
	 * Re-layout the labels for the new message.
	 */
	private void layoutForNewMessage() {
		int verticalSpacing = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING);
		int horizontalSpacing = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);
		
		if (errorMessage == null && messageImage == null) {