How to make block optional if the value for the below block not provided? const BackupType=new TerraformVariable(this,"BackupType",{ description:"(Require
debugview
dbcontext
gmnl
qradar
facebook-php-sdk
react-native-splash-screen
llvmlite
time-measurement
dhall
exceptionmapper
webinar
prims-algorithm
dining-philosopher
hybridauth
sml
flash-cs5.5
zero-pad
qmainwindow
dhclient
dfc
higher-kinded-types
cucumber-spring
xc32
multiple-apk
flask-injector
.net-core-5-preview-2
timezone
custom-code
broadleaf-commerce
systemdynamics
