can't use "Test" function

[yiruacm]

🐛 Bug Report

Cannot read property 'slice' of undefined

To Reproduce

click the button "Test",then report error.

Extension Output

` results[0].stdout = results[0].stdout.slice(1, -1).replace(/\n/g, '\n');
^

TypeError: Cannot read property 'slice' of undefined`

Your Environment

• os:windows10
• extension settings:default
• nodejs version:10.15.1
• vscode version:1.38.1
• extension version:0.15.6

[jdneo]

Dup with #455