Как осуществить обработку Exception в скриптах Microtrik?

:local interfaceName "ether2"
:local InterfaceISP2Address 

:if ([ :len [ /interface find name=$interfaceName ] ] = 0 ) do={
    :log warning "[SCRIPT_NAME] No interface '$interfaceName' was found, please do check updater script configuration."
    :set InterfaceISP2Address "0.0.0.0/0"
} else={
    # Get current IP address for the interface
    :set InterfaceISP2Address [ :tostr [ /ip address get [/ip address find interface=$interfaceName] address ] ]
}

:if ( [/ip address find interface=ether2 ] != "" ) do={\
 :local InterfaceISP2Address [/ip address get [find interface=ether2] address];\
}