Empty variable references set referencer NIL

[LeroyR]

Which generator version are you using?

build-generator 0.34.16
asdf            3.3.1
SBCL            2.1.8

What did you do?

1. Setting a variable to empty Strings "" or " " makes variables that reference this NIL

   • projects/broken.project:

     foo: 1
     bar: 2
     baz: |
       # foo 
       ${foo}
       # bar
       ${bar}

   • distributions/broken.distribution:

     - name: broken
       version: master
       parameters:
         foo: ""
       …

Same with empty string e.g. " "

Which behavior did you expect?

baz: |
# foo 
    
# bar
2

What happened instead?

baz: NIL