fix: 优化电压空判断

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

@@ -197,7 +197,9 @@ public class LineServiceImpl implements LineService {
     private void fillOther(List<Lines> list) {
         for (Lines line : list) {
             DyLevel dy = newCacheService.getDy(line.getDyLevelId());
-            line.setDyLevelName(dy.getName());
+            if (dy != null) {
+                line.setDyLevelName(dy.getName());
+            }
         }
     }