hudson.model.Fingerprint.RangeSet.fromString(...) accepts a malformed form of string which doesn't represent any range like:

• "1--5" or "1------5"
• "1,,5" or "1,,,,,,,5"
• "1-5-"
• ",-,"
• "1-"
• ",1,2"
• "5-1" etc.

Proposed fix:
We should be very rigid and careful of input validation because this function is directly utilized from e.g. AbstractBuildRangeCommand class where user input string is passed directly without any validation.