fix: 修复未选择上门时间，无法进入完成上门页面问题

pages/order/select-time.vue

@@ -9,7 +9,7 @@
         <view class="item-row flex-sb">
           <view class="title flex-l">上门时间</view>
           <uni-datetime-picker v-model="data.plan_time" type="datetime" :hide-second="true">
-            <view class="value flex-r value-empty" v-if="data.plan_time === ''">点击选择上门时间</view>
+            <view class="value flex-r value-empty" v-if="data.plan_time === null">点击选择上门时间</view>
             <view class="value flex-r" v-else>{{ helpers.removeSeconds(data.plan_time) }}</view>
           </uni-datetime-picker>
         </view>

utils/helpers.js

@@ -140,6 +140,10 @@ class helpers {
 	}
 
 	static removeSeconds(datetimeStr) {
+		if (datetimeStr === null) {
+			return ''
+		}
+
 		return datetimeStr.slice(0, 16);
 	}