fix mcp

src/fgai/graylog_source.py

@@ -46,7 +46,19 @@ class GraylogStreamSource:
             raise RuntimeError("invalid_graylog_field_mapping")
 
     def fetch(self, *, max_events: int = 5_000, range_seconds: int = 300) -> tuple[list[LogEvent], dict[str, object]]:
-        status = self.client.probe()
+        try:
+            status = self.client.probe()
+        except RuntimeError as exc:
+            return [], {
+                "status": "error",
+                "source": "graylog_mcp",
+                "events_fetched": 0,
+                "pages": 0,
+                "partial": True,
+                "error": f"probe_error: {exc}",
+                "truncated": False,
+                "latest_event_time": "",
+            }
         mapping_fields = [str(value) for value in self.mapping.values() if isinstance(value, str)]
         arguments: dict[str, object] = {
             "query": self.query,