Allow dumping/moving into payload voids

core/src/mindustry/world/blocks/payloads/PayloadVoid.java

@@ -48,6 +48,11 @@ public class PayloadVoid extends PayloadBlock{
             drawPayload();
         }
 
+        @Override
+        public boolean acceptUnitPayload(Unit unit){
+            return true;
+        }
+
         @Override
         public void updateTile(){
             if(moveInPayload(false) && cons.valid()){