hydrogen: Undefined at the end of results when cmd+return on javascript code

Description:

Undefined at the end of results when cmd+return on javascript code

Steps to Reproduce:

1. Open atom and write a simple JavaScript code
2. Select the code and do cmd+return
3. results would show up with undefined at the bottom. See screenshot

Versions:

Which OS and which version of Hydrogen and Atom are you running?

You can get this information from copy and pasting the output of atom --version from the command line.

Atom : 1.15.0 Electron: 1.3.13 Chrome : 52.0.2743.82 Node : 6.5.0 Mac : 10.10.5

Logs:

Please post any error logs and the output of the developer tools as described in our Debugging Guide.