fix: 优化电压空判断

xymanager_service/src/main/java/com/shxy/xymanager_service/impl/LineServiceImpl.java

@@ -197,9 +197,11 @@ public class LineServiceImpl implements LineService {
     private void fillOther(List<Lines> list) {
         for (Lines line : list) {
             DyLevel dy = newCacheService.getDy(line.getDyLevelId());
+            if (dy != null) {
                 line.setDyLevelName(dy.getName());
             }
         }
+    }
 
     /**
      * 添加线路