Missing Basename when using current directory as an input

[michael-kotliar]

Hi all!
If use current directory as an input, cwltool fails to set a basename for this folder:
WorkflowException: Invalid filename: '' contains illegal characters
If add basename manually to the input in job file, all works

cwltool version 1.0.20170413194156

tool.cwl

cwlVersion: v1.0
class: CommandLineTool
hints:
- class: DockerRequirement
  dockerPull: ubuntu:latest
inputs:
  control_dir:
    type: Directory
outputs: []
baseCommand: [echo, 'hello']

job_fail.json

{
  "control_dir": {"class": "Directory", "location": "."}
}

job_success.json

{
  "control_dir": {"class": "Directory", "location": ".", "basename":"any"}
}