fix: handle title display issue for empty route.meta.title (#91)

Author: qiyue2015

src/components/NavBar.vue

@@ -12,9 +12,10 @@ function onBack() {
 const { t } = useI18n()
 
 const title = computed(() => {
-  if (!route.meta || !route.meta.title)
+  if (!route.meta)
     return ''
-  return route.meta.i18n ? t(route.meta.i18n) : route.meta.title
+
+  return route.meta.i18n ? t(route.meta.i18n) : (route.meta.title || '')
 })
 </script>