Ignore "missing" k7abd Talkgroups__ZoneName.csv

[masenf]

Dodge this build error: https://github.com/hillsboro/k7vkt-codeplug/actions/runs/546636848

If the talkgroup mapping exists in one of the files, ignore the key error when reading Digital-Repeaters__ZoneName.csv

[masenf]

Add new test case to reproduce the issue

================================== test session starts ===================================
platform darwin -- Python 3.8.6, pytest-6.2.2, py-1.10.0, pluggy-0.13.1
cachedir: .tox/py38/.pytest_cache
rootdir: /Users/masen/code/dzcb, configfile: tox.ini, testpaths: tests
collected 1 item                                                                         

tests/test_k7abd.py F                                                              [100%]

======================================== FAILURES ========================================
_________________________ test_multiple_repeaters_one_talkgroups _________________________

    def test_multiple_repeaters_one_talkgroups():
        """
        a Digital-Repeaters__ZoneName.csv files does NOT require a Talkgroups__ZoneName.csv
        file, as long as all of the talkgroups are defined in at least one
        existing Talkgroups.csv
        """

        input_dir = Path(os.path.dirname(__file__)) / "multiple-repeaters-one-talkgroups"
>       cp = k7abd.Codeplug_from_k7abd(input_dir)

tests/test_k7abd.py:16: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

input_dir = PosixPath('/Users/masen/code/dzcb/tests/multiple-repeaters-one-talkgroups')

    def Codeplug_from_k7abd(input_dir):
        """
        :param input_dir: directory on the filesystem containing K7ABD ACB files
        :return: Codeplug
        """
        d = Path(input_dir)
        zones = {}
        talkgroups = {}
        all_talkgroups_by_name = {}
        total_files = 0
        for p in d.glob("Analog__*.csv"):
            update_zones_channels(zones, Analog_from_csv(p.read_text().splitlines()), log_filename=p)
            total_files += 1
        for p in d.glob("Talkgroups__*.csv"):
            name = p.name.replace("Talkgroups__", "").replace(".csv", "")
            talkgroups[name] = Talkgroups_map_from_csv(p.read_text().splitlines())
            logger.debug("Load %s talkgroups from %s", len(talkgroups[name]), p)
            # XXX: potential bug here if talkgroup definitions differ between files
            all_talkgroups_by_name.update(talkgroups[name])
        for p in d.glob("Digital-Others__*.csv"):
            update_zones_channels(zones, DigitalChannels_from_k7abd_csv(p.read_text().splitlines(), all_talkgroups_by_name), log_filename=p)
            total_files += 1
        for p in d.glob("Digital-Repeaters__*.csv"):
            zname = p.name.replace("Digital-Repeaters__", "").replace(".csv", "")
            # merge Talkgroup files, but prefer talkgroup names from this zone
            tg_csv = all_talkgroups_by_name.copy()
>           tg_csv.update(talkgroups[zname])
E           KeyError: 'Additional'

.tox/py38/lib/python3.8/site-packages/dzcb/k7abd.py:270: KeyError

[masenf]

Cool, github actions is able to find the regression in CI: https://github.com/masenf/dzcb/runs/1856059300?check_suite_focus=true#step:5:68