修正 pr332 出现的问题

liteflow-core/src/main/java/com/yomahub/liteflow/builder/el/LiteFlowChainELBuilder.java

@@ -2,6 +2,7 @@ package com.yomahub.liteflow.builder.el;
 
 import cn.hutool.core.collection.CollUtil;
 import cn.hutool.core.util.*;
+import cn.hutool.crypto.digest.MD5;
 import com.fasterxml.jackson.databind.JsonMappingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.ql.util.express.DefaultContext;
@@ -26,6 +27,7 @@ import com.yomahub.liteflow.log.LFLog;
 import com.yomahub.liteflow.log.LFLoggerManager;
 import com.yomahub.liteflow.property.LiteflowConfig;
 import com.yomahub.liteflow.property.LiteflowConfigGetter;
+import com.yomahub.liteflow.util.ElRegexUtil;
 
 import java.util.*;
 
@@ -182,6 +184,10 @@ public class LiteFlowChainELBuilder {
 		}
 
 		this.chain.setEl(elStr);
+
+		String elMd5 = MD5.create().digestHex(ElRegexUtil.normalize(elStr));
+		this.chain.setElMd5(elMd5);
+
 		LiteflowConfig liteflowConfig = LiteflowConfigGetter.get();
 		// 如果设置了不检查Node是否存在，那么这里是不解析的
 		if (liteflowConfig.getParseMode().equals(ParseModeEnum.PARSE_ONE_ON_FIRST_EXEC)){

liteflow-core/src/main/java/com/yomahub/liteflow/flow/FlowBus.java

@@ -108,7 +108,9 @@ public class FlowBus {
 
 		chainMap.put(chain.getChainId(), chain);
 
-		elMd5Map.put(chain.getElMd5(), chain.getChainId());
+		if (StrUtil.isNotBlank(chain.getEl())){
+			elMd5Map.put(chain.getElMd5(), chain.getChainId());
+		}
 
 		//如果有生命周期则执行相应生命周期实现
 		if (CollUtil.isNotEmpty(LifeCycleHolder.getPostProcessChainBuildLifeCycleList())){

liteflow-core/src/main/java/com/yomahub/liteflow/flow/element/Chain.java

@@ -254,10 +254,6 @@ public class Chain implements Executable {
     }
 
     public String getElMd5() {
-        // 若为 null 时，先规范化 EL，再计算 MD5
-        if (elMd5 == null) {
-            elMd5 = MD5.create().digestHex(ElRegexUtil.normalize(el));
-        }
         return elMd5;
     }