Debug hover: shows empty when hovering over bogus words

[isidorn]

Hi, VS Code dev here 👋

1. Have a python program and hover over some bogus words - like part of a string
2. Debug hover appears with no content
3. The issue here is that the python debug for evaluate of "This" returns a successful response. I suggest that for evaluating bogus expressions the python debugger returns a response with success = false

In this picture I am hovering over This.

Related issue: have a bogus expression in the WATCH view. The value is a structured object, instead it shuold just be an error like in the debug console

fyi @qubitron @DonJayamanne

[fabioz]

I think it's possible that this is this way because returning success=false on some cases force-stopped the debugger on Visual Studio (but I think that this should be fixed now), so, returning success=false should be ok at this point (but we should double-check with the Visual Studio team).

I created #2014 to address the issue related to the error as a str.

[isidorn]

Ok thanks.