(bug) undefined variables for terraform plan indefinetely holds the process

[ShubhamTiwary914]

context

Running terravision visualise or terraform plan with --source to a terraform project which has some TF_VAR_varname=... undefined (one or more) indefinetely halts as such:

 _____                          _     _
/__   \___ _ __ _ __ __ ___   _(_)___(_) ___  _ __
  / /\/ _ \ '__| '__/ _` \ \ / / / __| |/ _ \| '_ \
 / / |  __/ |  | | | (_| |\ V /| \__ \ | (_) | | | |
 \/   \___|_|  |_|  \__,_| \_/ |_|___/_|\___/|_| |_|



Preflight check..
  dot command detected: /usr/bin/dot
  gvpr command detected: /usr/bin/gvpr
  git command detected: /usr/bin/git
  terraform command detected: /usr/bin/terraform
  terraform version detected: Terraform v1.14.8



Calling Terraform..
  Forcing temporary local backend to generate full infrastructure plan

Initalising workspace: default


Generating Terraform Plan..

There is no error or timeout of any sort, just stuck in this purgatory.

But if all TF_VAR_varname (tf variables) are defined, then it works fine.

probable solution: there should be either (1) a input to ask for undefined variables like how terraform plan does or (2) simply just throw the process and ask these to be defined in env variables list.