Fix undefined error when debugging modules (#589)
Fix undefined error when debugging modules (#589)

Fixes an issue where launching a debug session with modules results in the error "Cannot read property 'cwd' of undefined"
DonJayamanne/pythonVSCode,DonJayamanne/pythonVSCode,DonJayamanne/pythonVSCode,DonJayamanne/pythonVSCode,DonJayamanne/pythonVSCode