App label validation fail when app.label is not given

[lsilvs]

Expected behavior

I expect the application to start with label equal to nethash if app label is not present in config.

Actual behavior

If crashes due to schema validation as app label expect to start with [a-zA-Z] and nethash can start with [0-9]

Steps to reproduce

Remove app label from config and try to start the application on devenet

Which version(s) does this affect? (Environment, OS, etc...)

2.0