[BUG]Regression: testGetCitiesOfRegion fails on nightly build

[Wolfgang Fahl]

ERROR: testGetCitiesOfRegion (tests.test_wikidata.TestWikidata)
Test getting cities based on region wikidata id
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Traceback (most recent call last):
  File "/hd/luxio/var/lib/jenkins/jobs/geograpy3/workspace/tests/test_wikidata.py", line 105, in testGetCitiesOfRegion
    biggestCity=cities[0]
IndexError: list index out of range

• Python Version [e.g. 3.6]

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