Bug#913952: python-xarray: empty package when only python3 version is python3.7

[Jeremy Bicha]

Source: python-xarray
Version: 0.11.0-1
Severity: serious
Tags: patch

python-xarray 0.11.0-1 made this surprising addition in its
dh_auto_install override:
rm -rf debian/python3-xarray/usr/lib/python3.7

This results in a basically empty package on Ubuntu 19.04 Alpha where
python3.7 is the only supported python3 version.

I am filing this as serious since python3.7 will soon be the only
supported python3 version in Debian Unstable.

In my next email, I am attaching a patch that might fix this issue. At
least the build completes successfully in both Debian Unstable and
Ubuntu 19.04 but I didn't try running it or running any tests.

Build log
------------
https://launchpad.net/ubuntu/+source/python-xarray/0.11.0-2/+build/15670729

This bug was detected by the 0.11.0-2 autopkgtest on Ubuntu:
https://autopkgtest.ubuntu.com/packages/p/python-xarray/disco/amd64

Thanks,
Jeremy Bicha