Apparently some callers of `get_package_version` expect it to return
None if a package wasn't found... e.g. when CI is testing a branch that
introduces a new aport and it's trying to get the upstream version for
it, which doesn't exist.
This leads to a spectacular crash in CI:
upstream = get_package_version(args, package, commit, False)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/clayton/src/pmaports/./.ci/lib/check_changed_aports_versions.py", line 47, in get_package_version
return parsed["pkgver"] + "-r" + parsed["pkgrel"]
~~~~~~^^^^^^^^^^
TypeError: 'NoneType' object is not subscriptable
When I refactored this method in 07812a918 I goofed up and changed this
behavior, so let's restore it to fix the crash.
a263494c1c