fix: 添加备件

src/components/createCom/XhParts.vue

@@ -4,7 +4,7 @@
     <view class="list u-flex u-row-between">
 			<image class="item-image" :src="mixingImage" v-if="item.required"></image>
 			<view class="u-m-r-20">{{item.fieldsTitle}}</view>
-			<view class="u-flex-1 add-parts" @click="toParts" v-if="!disabled">
+			<view class="u-flex-1 add-parts" @click="toParts" v-if="!disabled && lists.length > 0">
 				添加备件<u-icon name="arrow-right" color="#2979ff" size="30"></u-icon>
 			</view>
 		</view>