添加可选

src/components/wfd/components/DetailPanel/EndEventDetail.vue

@@ -36,6 +36,7 @@
           style="width:90%; font-size:12px"
           placeholder="选择子流程"
           :disabled="readOnly"
+          clearable
           :value="model.transferProcess"
           :filterable="true"
           @change="(e) => onChange('transferProcess', e)"