Fix no proxy set ptoper type

Author: corest

bbot/core/helpers/web/engine.py

@@ -68,7 +68,7 @@ def _AsyncClient_noproxy(self, *args, **kwargs):
 
             noproxy_config = dict(self.config)
             noproxy_web = dict(noproxy_config.get("web", {}))
-            noproxy_web["http_proxy"] = ""
+            noproxy_web["http_proxy"] = None
             noproxy_config["web"] = noproxy_web
             client = BBOTAsyncClient.from_config(noproxy_config, self.target, *args, **kwargs)
             self.noproxy_web_clients[client.retries] = client