获取依赖moduleList后先判断是否存在，再执行ModuleList里面的Default Rule

gjjs-bd-runtime/src/main/java/com/brilliance/mda/runtime/mda/driver/DCR.java

@@ -314,31 +314,33 @@ public class DCR {
         //3.如果依赖moduleList，执行ModuleList里面的Default Rule
         //3.1查找该ModuleList的Emitter
         ModuleList moduleList = (ModuleList)MdaDriver.getBaseObject(null,path);
+        if(!MdaUtils.isEmpty(moduleList)) {
             AbstractScopeEmitter emitterOfModuleList = getModuleListEmitter(moduleList.getDataClass());
-        if(emitter == null){
+            if (emitter == null) {
                 keyStack.pop();
                 return;
             }
             //3.2深入执行该ModuleList每一项的default rule
-        Map<String,Map<String,Object>> subMergeQueue = (Map<String,Map<String,Object>>)flagOrDps;
-        subMergeQueue.entrySet().forEach(entry->{
+            Map<String, Map<String, Object>> subMergeQueue = (Map<String, Map<String, Object>>) flagOrDps;
+            subMergeQueue.entrySet().forEach(entry -> {
                 String idxStr = entry.getKey();
                 int num = Integer.parseInt(idxStr);
-            if(num <= 0){
+                if (num <= 0) {
                     return;
                 }
-            if(moduleList.size() <= 0){
+                if (moduleList.size() <= 0) {
                     return;
                 }
-            if (moduleList == null || moduleList.isEmpty()){
+                if (moduleList == null || moduleList.isEmpty()) {
                     return;
                 }
                 IModule subRootModule = moduleList.getElement(num);
                 //3.3设置上下文，以当前数据项为root点，执行Default
                 emitterOfModuleList.acceptContext(subRootModule);
-            executeMergedQueue(subRootModule,emitterOfModuleList,rootMergeMap,entry.getValue(),keyStack);
+                executeMergedQueue(subRootModule, emitterOfModuleList, rootMergeMap, entry.getValue(), keyStack);
                 emitterOfModuleList.removeContext();
             });
+        }
         //执行一下自己
         //emitter.executeDefault(path);
         keyStack.pop();