修复在线音乐列表获取失败时无限循环请求的问题

src/renderer/utils/music/mg/musicSearch.js

@@ -110,7 +110,8 @@ export default {
     })
     return list
   },
-  search(str, page = 1, { limit } = {}) {
+  search(str, page = 1, { limit } = {}, retryNum = 0) {
+    if (++retryNum > 3) return Promise.reject(new Error('try max num'))
     if (limit != null) this.limit = limit
     // http://newlyric.kuwo.cn/newlyric.lrc?62355680
     return this.musicSearch(str, page).then(result => {
@@ -118,7 +119,7 @@ export default {
       if (!result || result.success !== true) return Promise.reject(new Error(result ? result.info : '搜索失败'))
       let list = result.musics ? this.handleResult(result.musics) : []
 
-      if (list == null) return this.search(str, page, { limit })
+      if (list == null) return this.search(str, page, { limit }, retryNum)
 
       this.total = parseInt(result.pgt)
       this.page = page