review: 优化审批时，校验选择的下一个节点的审批人，是否合法

yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/core/util/BpmnModelUtils.java

@@ -907,9 +907,16 @@ public class BpmnModelUtils {
      * @return 符合条件的路径
      */
     private static SequenceFlow findMatchSequenceFlowByExclusiveGateway(Gateway gateway, Map<String, Object> variables) {
-        SequenceFlow matchSequenceFlow = CollUtil.findOne(gateway.getOutgoingFlows(),
+        // TODO 表单无可编辑字段时variables为空，流程走向会出现问题，比如流程审批过程中无需要修改的字段值，
+        SequenceFlow matchSequenceFlow;
+        if (CollUtil.isNotEmpty(variables)){
+             matchSequenceFlow = CollUtil.findOne(gateway.getOutgoingFlows(),
                     flow -> ObjUtil.notEqual(gateway.getDefaultFlow(), flow.getId())
                             && (evalConditionExpress(variables, flow.getConditionExpression())));
+        }else {
+            matchSequenceFlow = CollUtil.findOne(gateway.getOutgoingFlows(),
+                    flow -> ObjUtil.notEqual(gateway.getDefaultFlow(), flow.getId()));
+        }
         if (matchSequenceFlow == null) {
             matchSequenceFlow = CollUtil.findOne(gateway.getOutgoingFlows(),
                     flow -> ObjUtil.equal(gateway.getDefaultFlow(), flow.getId()));

yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/core/util/FlowableUtils.java

@@ -194,7 +194,7 @@ public class FlowableUtils {
     @SuppressWarnings("unchecked")
     public static Map<String, List<Long>> getStartUserSelectAssignees(Map<String, Object> processVariables) {
         if (processVariables == null) {
-            return new HashMap<>();
+            return null;
         }
         return (Map<String, List<Long>>) processVariables.get(
                 BpmnVariableConstants.PROCESS_INSTANCE_VARIABLE_START_USER_SELECT_ASSIGNEES);
@@ -214,12 +214,12 @@ public class FlowableUtils {
      * 获得流程实例的审批用户选择的下一个节点的审批人 Map
      *
      * @param processVariables 流程变量
-     * @return 审批用户选择的下一个节点的审批人Map
+     * @return 审批用户选择的下一个节点的审批人Map Map
      */
     @SuppressWarnings("unchecked")
     public static Map<String, List<Long>> getApproveUserSelectAssignees(Map<String, Object> processVariables) {
         if (processVariables == null) {
-            return new HashMap<>();
+            return null;
         }
         return (Map<String, List<Long>>) processVariables.get(
                 BpmnVariableConstants.PROCESS_INSTANCE_VARIABLE_APPROVE_USER_SELECT_ASSIGNEES);

yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/service/task/BpmTaskServiceImpl.java

@@ -600,7 +600,9 @@ public class BpmTaskServiceImpl implements BpmTaskService {
                     throw exception(PROCESS_INSTANCE_START_USER_SELECT_ASSIGNEES_NOT_CONFIG, nextFlowNode.getName());
                 }
                 processVariables = FlowableUtils.getStartUserSelectAssignees(processInstance.getProcessVariables());
-                if (CollUtil.isNotEmpty(processVariables)) {
+                if (processVariables == null){
+                    processVariables = new HashMap<>();
+                }else {
                     List<Long> startUserSelectAssignee = processVariables.get(nextFlowNode.getId());
                     // 特殊：如果当前节点已经存在审批人，则不允许覆盖
                     if (CollUtil.isNotEmpty(startUserSelectAssignee)) {
@@ -619,7 +621,9 @@ public class BpmTaskServiceImpl implements BpmTaskService {
                     throw exception(PROCESS_INSTANCE_APPROVE_USER_SELECT_ASSIGNEES_NOT_CONFIG, nextFlowNode.getName());
                 }
                 processVariables = FlowableUtils.getApproveUserSelectAssignees(processInstance.getProcessVariables());
-                if (CollUtil.isNotEmpty(processVariables)) {
+                if (processVariables == null){
+                    processVariables = new HashMap<>();
+                }else  {
                     List<Long> approveUserSelectAssignee = processVariables.get(nextFlowNode.getId());
                     // 特殊：如果当前节点已经存在审批人，则不允许覆盖
                     if (CollUtil.isNotEmpty(approveUserSelectAssignee)) {