refactoring tile delete method

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

@@ -3,7 +3,6 @@ package de.srsoftware.web4rail.tiles;
 import java.util.HashMap;
 import java.util.Map;
 
-import de.srsoftware.web4rail.BaseClass;
 import de.srsoftware.web4rail.Connector;
 import de.srsoftware.web4rail.Plan.Direction;
 import de.srsoftware.web4rail.tiles.Turnout.State;
@@ -22,9 +21,4 @@ public class DiagNE extends Tile{
 				return new HashMap<>();
 		}
 	}
-	
-	@Override
-	protected void removeChild(BaseClass child) {
-		// this class has no child elements		
-	}
 }