🐛 Fix error when log channel doesn't exist. (#138)

🐛 修复日志频道不存在时的报错。

pagermaid/__init__.py

@@ -344,7 +344,10 @@ async def log(message):
     )
     if not strtobool(config['log']):
         return
+    try:
         await bot.send_message(
             int(config['log_chatid']),
             message
         )
+    except ValueError:
+        pass