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Fix invalid Debian codename

QU DONGFANG requested to merge qudongfang-guest/python-apt:fix_invalid_debian_codename into master

Sometimes codename is n/a which is not right. I noticed that codename is come from _lsb_release() in aptsources/distro.py. However lsb_release -a may give a wrong result. Maybe we could try cat /etc/debian_version. All Debian derives should have this file.

# lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 9.6 (n/a)
Release:	9.6
Codename:	n/a

# cat /etc/debian_version
buster/sid

# cut -f1 -d'/' /etc/debian_version
buster

# cat /etc/issue
Debian GNU/Linux buster/sid \n \l

# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux buster/sid"
NAME="Debian GNU/Linux"
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"
Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 95, in <module>
    sp = SoftwareProperties(options=options)
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 109, in __init__
    self.reload_sourceslist()
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 599, in reload_sourceslist
    self.distro.get_sources(self.sourceslist)
  File "/usr/lib/python3/dist-packages/aptsources/distro.py", line 93, in get_sources
    (self.id, self.codename))
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template for Debian/n/a

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