补充多实例用户非空判断

ibzwf-core/src/main/java/cn/ibizlab/core/workflow/extensions/listener/ProcessInstanceListener.java

@@ -4,6 +4,7 @@ import cn.ibizlab.core.workflow.domain.WFMember;
 import cn.ibizlab.core.workflow.extensions.domain.FlowUser;
 import cn.ibizlab.core.workflow.extensions.service.WFCoreService;
 import cn.ibizlab.core.workflow.extensions.service.WFModelService;
+import cn.ibizlab.util.errors.BadRequestAlertException;
 import cn.ibizlab.util.service.RemoteService;
 import com.alibaba.fastjson.JSONObject;
 import com.fasterxml.jackson.databind.ObjectMapper;
@@ -204,14 +205,17 @@ public class ProcessInstanceListener extends AbstractFlowableEventListener {
                     }
                 }
 
+                //设置会签用户
+                if(!ObjectUtils.isEmpty(processUserIds)){
+                    event.getExecution().setVariableLocal("candidateUsersList",processUserIds);
+                }
+                else{
+                    throw new BadRequestAlertException(String.format("工作流操作失败，无法获取[%s]步骤用户",task.getName()),"ProcessInstanceListener","getStepUsers");
+                }
                 //计算角色
                 if(!ObjectUtils.isEmpty(processRoles) && ObjectUtils.isEmpty(event.getExecution().getVariable("all_roles"))){
                     event.getExecution().setVariableLocal("all_roles_cnt",processRoles.size());
                 }
-                //设置会签用户
-                if(!StringUtils.isEmpty(processUserIds)){
-                    event.getExecution().setVariableLocal("candidateUsersList",processUserIds);
-                }
             }
         }
         else if(evt instanceof FlowableEntityWithVariablesEventImpl  )