fix(rcon): allow online motto updates outside rooms

SetMotto updated the in-memory motto and then unconditionally broadcast RoomUserData through the current room. Online users without a current room could throw a null-pointer exception after the state change, making the RCON call report an error despite mutating the user. Only broadcast room data when a room is present and cover the invariant with a contract test.

Emulator/src/test/java/com/eu/habbo/messages/rcon/SetMottoContractTest.java

@@ -0,0 +1,22 @@
+package com.eu.habbo.messages.rcon;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class SetMottoContractTest {
+    private static String setMottoSource() throws Exception {
+        return Files.readString(Path.of("src/main/java/com/eu/habbo/messages/rcon/SetMotto.java"));
+    }
+
+    @Test
+    void onlineMottoUpdateDoesNotRequireCurrentRoom() throws Exception {
+        String source = setMottoSource();
+
+        assertTrue(source.contains("getCurrentRoom() != null"),
+                "RCON SetMotto must not fail for online users outside a room");
+    }
+}