fix: 修复无广告位问题

apps/mobile/src/views/tabbar/Home.vue

@@ -469,7 +469,7 @@ export default {
             } else {
               this.AD.header = {}
             }
-            if (full.length) {
+            if (full?.length) {
               this.AD.full = full.map(adConfigFormatter)[0]
             } else {
               this.onInitNextDialog()