解决寝室号生成为null的问题

src/main/java/com/xjrsoft/module/room/service/impl/RoomServiceImpl.java

@@ -77,7 +77,7 @@ public class RoomServiceImpl extends MPJBaseServiceImpl<RoomMapper, Room> implem
         for (int i = 0; i < dto.getFloorRoomsCount(); i ++){
             for (String floorNumber : dto.getFloorNumber().split(",")) {
                 String roomName = "";
-                if(roomRule.getRule().contains("1")){
+                if(roomRule.getRule().contains("1") && build.getBuildNumber() != null){
                     roomName += build.getBuildNumber();
                 }
                 if(roomRule.getRule().contains("2")){