[Bug] 4.2.0 - FreeMarker template error: sendEnabled is null or missing in message-inspector.ftlh when sending message

[raphael-pee]

Bug Report: FreeMarker template error when sending message - sendEnabled null or missing

Version: 4.2.0

Description:
When attempting to send a message to a topic via the UI, a FreeMarker template error occurs because sendEnabled evaluates to null or missing in message-inspector.ftlh at line 95.

Despite the error, the message is successfully sent — so this appears to be a rendering issue after submission rather than a functional failure.

Error:

FreeMarker template error: The following has evaluated to null or missing:
==> sendEnabled [in template "message-inspector.ftlh" at line 95, column 12]
----
Failed at: #if sendEnabled [in template "message-inspector.ftlh" at line 95, column 7]

Steps to Reproduce:

1. Start Kafdrop 4.2.0 with --message.sendEnabled=true
2. Navigate to a topic
3. Click "Send Message" and submit
4. FreeMarker template error page is displayed

Expected Behavior:
Message is sent and the UI renders normally without error.

Actual Behavior:
Message is sent successfully, but a FreeMarker template error is displayed because sendEnabled is not passed to the template in this request flow.

Configuration:

CMD_ARGS: --message.sendEnabled=true

Environment:

• Kafdrop version: 4.2.0
• Deployment: Kubernetes
• Java: from Docker image obsidiandynamics/kafdrop:4.2.0

Possible Fix:
Ensure sendEnabled is included in the model passed to message-inspector.ftlh for all request flows, not just the initial page render.

[nguyen-tri-nhan]

I just added it in #856
Let's check it with latest version, TY