tree 245ba1b5b3731cfb3214857d6ad85bd3b825c398
parent d020485d8f5336bc1d1e3f19a8bc240c371824c3
author Antonio Barone <syntonyze@gmail.com> 1615211921 +0100
committer Antonio Barone <syntonyze@gmail.com> 1615293315 +0000

Default git http username and password to empty strings

Not having a default for Gerrit http username and password causes
Jenkins to fail due to:

```
IllegalArgumentException: Null value not allowed as an environment
variable
```

Default gerrit http username and password to empty strings and check for
empty values to decide whether to use vault defaults.

Bug: Issue 14194
Change-Id: Ic719dfcde11e00f1bb272b2ff7954dc47fc03e27