3-Digit country codes can get anonymized to three spaces

[SHMvanHouten]

Anonimatron version:1.10.1

The behaviour of anonymizing 3 digit country codes is inconsistent:

Expected outcome or behaviour:

When you try to anonymize a country code you expect another three letter country code for the anonymized value.

Actual outcome or behavior:

Occasionally a country code will get anonymized to three spaces, this is because of the behaviour of Locale.getISO3Country()) which can return an empty String, this empty String then gets padded out to 3 spaces.

I am submitting a pull request next which I think should solve the issue.

[realrolfje]

There was one failing test but that was the Travis server which took too long hashing 2000 strings.