overhauled registry

src/main/java/de/srsoftware/web4rail/tiles/Eraser.java

@@ -1,5 +1,10 @@
 package de.srsoftware.web4rail.tiles;
 
-public class Eraser extends Tile {
+import de.srsoftware.web4rail.BaseClass;
 
+public class Eraser extends Tile {
+	@Override
+	protected void removeChild(BaseClass child) {
+		// this class has no child elements		
+	}
 }