sources.list empty line results in debootstrap error

[svanschu]

I had the error that debootstrap is called with to less values (see image)
After a while I noticed that I had a empty line at the end of my sources.list file. Deleting this line fixed the issue.

The script reads every line, if it's empty or not.

Two possibility

1. raise a worthy error message, which states the real problem
2. just check if a line is empty and ignore empty lines ...

Reproduce:
Add empty lines to your sources.list for debootstrap and you should run into the error.

isar/meta/recipes-core/isar-bootstrap/isar-bootstrap.inc

Line 230 in b6ac71a

isar_bootstrap() {