Merge pull request #888 from Tigrex-Dai/master

fix: 添加了针对报错内容对event.sender中'role'的存在性检查

pkg/platform/sources/aiocqhttp.py

@@ -173,6 +173,7 @@ class AiocqhttpEventConverter(adapter.EventConverter):
         if event.message_type == "group":
             permission = "MEMBER"
 
+            if "role" in event.sender:
                 if event.sender["role"] == "admin":
                     permission = "ADMINISTRATOR"
                 elif event.sender["role"] == "owner":