Debugger: Attach to process: 'null' doesn't look like a process id.

[normalser]

• VSCode Version: Code - Insiders 1.8.0-insider (2bd85b8, 2016-11-30T07:05:07.830Z)
• OS Version: Darwin x64 16.1.0

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Steps to Reproduce:

1. Press F5

2. Input box gets displayed with:
   

3. Press Esc

4. You get:
   

Should probably just close the input box from step #2

[chrmarti]

Reproduced with:

        {
            "type": "node",
            "request": "attach",
            "name": "Attach to Process",
            "processId": "${command.PickProcess}"
        }

[isidorn]

I simply improved the error message
Yes, ideally we would not even start debugging but that would require some checking of the launch.json for unreplaced variables which is ugly code that I do not want to introduce.
@weinand can improve this message on the adapter side if needed

[weinand]

@isidorn you've fixed this with a real fix for Jan 2017. Please add a comment what you did and close the issue.

[isidorn]

Dup of #18601
Now the cancelation of replacment by the user is nicely propagating through so the debug service does not continue with the launch / attach request