Hi,
There is a concept called 'Ignore Text' in Variations feature of CatTools.
Unfortunately Cisco.MDS.Fibre is not having the feature as of now.
Please try configure your device as 'Generic.Device' type; By using variations feature you can change ll the prompts properly.
And use the 'Backup Ignore Text' option (3rd Tab in Variations), Enable and provide the text as '^snmp-server enable traps fcdomain' and run the activity.
Thanks,
Nanda