Merge pull request jxxghp#4958 from cddjr/fix_browse_mteam

Author: jxxghp

app/modules/indexer/spider/mtorrent.py

@@ -76,7 +76,7 @@ def __get_params(self, keyword: str, mtype: MediaType = None, page: Optional[int
         else:
             categories = self._movie_category
         # mtorrent搜索imdb需要输入完整imdb链接，参见 https://wiki.m-team.cc/zh-tw/imdbtosearch
-        if keyword.startswith("tt"):
+        if keyword and keyword.startswith("tt"):
             keyword = f"https://www.imdb.com/title/{keyword}"
         return {
             "keyword": keyword,