优化Script功能模块的一些结构问题

liteflow-script-plugin/liteflow-script-qlexpress/src/main/java/com/yomahub/liteflow/script/qlexpress/QLExpressScriptExecutor.java

@@ -56,7 +56,7 @@ public class QLExpressScriptExecutor implements ScriptExecutor {
         try{
             if (!compiledScriptMap.containsKey(nodeId)){
                 String errorMsg = StrUtil.format("script for node[{}] is not loaded", nodeId);
-                throw new RuntimeException(errorMsg);
+                throw new ScriptLoadException(errorMsg);
             }
 
             InstructionSet instructionSet = compiledScriptMap.get(nodeId);