client validation

    scopes:
    - name: global
      dvars:
      - name: student_name
        desc: show that if required ENV var is empty and it will fail if this is empty
        value: '{{ env "STUDENT_NAME" |validateMandatoryFailIfNone "student_name" }}'
    #same as below:
    #        value: '{{ expandenv "$STUDENT_NAME" |validateMandatoryFailIfNone "student_name" }}'
    
    tasks:
    - name: task
    

    loading [Config]:  ./tests/functests/upconfig.yml
    Main config:
                 Version -> 1.0.0
                  RefDir -> ./tests/functests
                 WorkDir -> cwd
              AbsWorkDir -> /up_project/up
                TaskFile -> f0045
                 Verbose -> vvv
              ModuleName -> self
               ShellType -> /bin/sh
           MaxCallLayers -> 8
                 Timeout -> 3600000
     MaxModuelCallLayers -> 256
               EntryTask -> task
      ModRepoUsernameRef -> 
      ModRepoPasswordRef -> 
    work dir: /up_project/up
    -exec task: task
    loading [Task]:  ./tests/functests/f0045
    module: [self], instance id: [dev], exec profile: []
    profile -  envVars:
    
    (*core.Cache)({
    })
    
      ERROR: validateMandatoryFailIfNone [Required var:(student_name) must not be empty, please fix it]