TitleAreaDialog: fix Widget is disposed on close eclipse-platform#1094

eclipse-platform#1094

Author: EcljpseB0T

bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/TitleAreaDialog.java

@@ -685,7 +685,7 @@ public void setTitleAreaColor(RGB color) {
 	public void setTitleImage(Image newTitleImage) {
 
 		titleAreaImage = newTitleImage;
-		if (titleImageLabel != null) {
+		if (titleImageLabel != null && !titleImageLabel.isDisposed()) {
 			titleImageLabel.setImage(newTitleImage);
 			determineTitleImageLargest();
 			Control top;