fixed bug when deleting tiles

src/main/java/de/srsoftware/web4rail/actions/ShowText.java

@@ -21,11 +21,6 @@ public class ShowText extends TextAction{
 		return new Label(t("Text to display on clients:")+NBSP);
 	}
 	
-	@Override
-	protected void removeChild(BaseClass child) {
-		// this class has no child elements		
-	}
-	
 	@Override
 	public String toString() {
 		return t("Display \"{}\" on clients.",text);