MQTT Broker: can submit credentials form with missing values

[knolleary]

Current Behavior

The MQTT Broker form is missing validation - allowing it to be submitted without required fields.

The minimum set of required fields are:

• name
• host

Expected Behavior

Should not be able to submit the credentials form (for both create and edit states) if the name or host fields are blank.

Steps To Reproduce

No response

Environment

• FlowFuse version:
• Node.js version:
• npm version:
• Platform/OS:
• Browser:

Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate

[hardillb]

closed by #5099