[Fix] Router/ Proxy - Tag Based routing, raise correct error when no deployments found and tag filtering is on (#5745)

* fix tag routing - raise correct error when no model with tag based routing

* fix error string from tag based routing

* test router tag based routing

* raise 401 error when no tags avialable for deploymen

* linting fix

litellm/router.py

@@ -5180,6 +5180,7 @@ class Router:
             # check if user wants to do tag based routing
             healthy_deployments = await get_deployments_for_tag(  # type: ignore
                 llm_router_instance=self,
+                model=model,
                 request_kwargs=request_kwargs,
                 healthy_deployments=healthy_deployments,
             )