How to make block optional if the value for the below block not provided? const BackupType=new TerraformVariable(this,"BackupType",{ description:"(Require
verbosegc
android-native-library
metaspace
stenciljs
remoteapp
hapi-swagger
webproxy
centos7
html5-template
traefik-authentication
guzzle-service-description
tuxedo
wordpress-rest-api
taylor-series
mcisendstring
social-gaming
mpic++
libreoffice-macros
xcode10.3
cg
matrix-inverse
bonsai-elasticsearch">bonsai-elasticsearch
couchdb-2.0
filereference
device-admin
inspect
image-translation
http-toolkit
json-c
c++11
bonsai-elasticsearch