fix: 优化报错信息

src/main/java/com/xydl/cac/iec/IecClient.java

@@ -3,6 +3,7 @@ package com.xydl.cac.iec;
 import com.beanit.iec61850bean.*;
 import com.xydl.cac.entity.IcdIed;
 import com.xydl.cac.entity.constants.Constants;
+import com.xydl.cac.exception.BusinessException;
 import com.xydl.cac.model.StaticVariable;
 import com.xydl.cac.socket.WebSocketServer;
 import lombok.extern.slf4j.Slf4j;
@@ -95,6 +96,9 @@ public class IecClient implements ClientEventListener {
 
     public String getValue(String paramindex, String fc) throws Exception {
         FcModelNode node = (FcModelNode) serverModel.findModelNode(paramindex, Fc.valueOf(fc));
+        if (node == null) {
+            throw new BusinessException("icd文件里未找到该节点, " + fc + " " + paramindex);
+        }
         clientAssociation.getDataValues(node);
         if (node instanceof BasicDataAttribute) {
             String value = ((BasicDataAttribute) node).getValueString();