feat(REQ-4468) - 优化前端针对监管模型不设置 node 的情况

workflow-engine-core/src/main/java/cn/axzo/workflow/core/common/utils/BpmnJsonConverterUtil.java

@@ -599,6 +599,9 @@ public final class BpmnJsonConverterUtil {
      */
     private static List<String> create(String formKey, BpmnJsonNode bpmnJsonNode, Process mainProcess,
                                        BpmnModel bpmnModel, BpmnJsonNode defaultConditionConnectNode, String... preNodeIds) {
+        if(Objects.isNull(bpmnJsonNode)) {
+            return Lists.newArrayList(preNodeIds);
+        }
         // 设置来源节点
         bpmnJsonNode.setIncoming(Lists.newArrayList(preNodeIds));