fix auth.py

Exclude params with value None

Author: lovvvve

src/cmdb/core/auth.py

@@ -4,7 +4,7 @@
 def build_api_key(key: str, secret: str, path: str, params: dict) -> dict:
     values = [ 
         str(params[k]) for k in sorted(params.keys())
-        if (k not in ("_key", "_secret") and not isinstance(params[k], (dict, list)))
+        if (k not in ("_key", "_secret") and not isinstance(params[k], (dict, list)) and params[k] is not None)
     ]
     values = "".join(values) or ""
     _secret = "".join([path, secret, values]).encode("utf-8")