update BlogQuestion.vue

src/views/blog/BlogQuestion.vue

@@ -145,7 +145,7 @@ export default {
       this.queryInfo.pn = parseInt(pageNumber)
     }
     const categoryId = this.$route.query.categoryId
-    if (categoryId !== undefined && categoryId !== null) {
+    if (categoryId !== undefined && categoryId !== '') {
       this.queryInfo.categoryId = parseInt(categoryId)
     }