migrate and update commands are failing where everything is up-to-date

[DimitarTachev]

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.0.1

To Reproduce

1. tns migrate
2. tns migrate

• the second migrate will exit with code 127 and red error

3. tns update
4. tns update

• the second update will exit with code 127 and red error

Expected behavior
When everything is up-to-date, the CLI should exit with code 0 and green message.