fix: Default path in asgi_scope to empty string (#21602)

Sometimes requests come in with an empty asgi scope
Default path to "" in these cases just so string startswith doesn't break

posthog/settings/sentry.py

@@ -75,7 +75,7 @@ def traces_sampler(sampling_context: dict) -> float:
         path = sampling_context.get("wsgi_environ", {}).get("PATH_INFO")
         force_sample = bool(sampling_context.get("wsgi_environ", {}).get("HTTP_FORCE_SAMPLE"))
         if os.environ.get("SERVER_GATEWAY_INTERFACE") == "ASGI":
-            path = sampling_context.get("asgi_scope", {}).get("path")
+            path = sampling_context.get("asgi_scope", {}).get("path", "")
             headers = sampling_context.get("asgi_scope", {}).get("headers", [])
             for name, value in headers:
                 if name.lower().replace(b"_", b"-") == "force-sample":