refactor: improve error handling for gateway connection in LDAP functions

backend/src/services/app-connection/ldap/ldap-connection-fns.ts

@@ -124,7 +124,10 @@ export const executeWithPotentialGateway = async <T>(
       targetPort: port
     });
 
-    if (platformConnectionDetails) {
+    if (!platformConnectionDetails) {
+      throw new BadRequestError({ message: "Unable to connect to gateway, no platform connection details found" });
+    }
+
     return withGatewayV2Proxy(
       async (proxyPort) => {
         const proxyUrl = constructLdapUrl(protocol, "localhost", proxyPort);
@@ -161,7 +164,6 @@ export const executeWithPotentialGateway = async <T>(
       }
     );
   }
-  }
 
   // Non-gateway path - calls getLdapConnectionClient which has validation
   const client = await getLdapConnectionClient(credentials);