remove all trailing blank lines

by running this command:
git ls-files -z | xargs -0 perl -pi -0777 -e 's/\n\n+$/\n/'
This is in preparation for a more strict make syntax-check
rule that will detect trailing blank lines.

examples/domain-events/events-python/event-test.py

@@ -212,4 +212,3 @@ def main():
 
 if __name__ == "__main__":
     main()
-