fix React rules on AgentRoute component (#2413)

Author: carlos-cne

client/src/routes/overview.tsx

@@ -7,14 +7,15 @@ import { type UUID } from "@elizaos/core";
 export default function AgentRoute() {
     const { agentId } = useParams<{ agentId: UUID }>();
 
-    if (!agentId) return <div>No data.</div>;
-
     const query = useQuery({
         queryKey: ["agent", agentId],
-        queryFn: () => apiClient.getAgent(agentId),
+        queryFn: () => apiClient.getAgent(agentId ?? ""),
         refetchInterval: 5_000,
+        enabled: Boolean(agentId),
     });
 
+    if (!agentId) return <div>No data.</div>;
+
     const character = query?.data?.character;
 
     if (!character) return null;