code: private Properties initChecksumProps(Map<String, Set<String>> useOldChecksums) {
          Properties checksumProps = new Properties();
          for (Set<String> set : useOldChecksums.values()) {
              for (String s : set) {
                  checksumProps.put(s, "");
              }
          }
          return checksumProps;
      }
docs: Populates a new property file with the inputed checksum map and empty strings.
  
  @param useOldChecksums a map of the old checksums
  @return a new Properties object containing the old checksums as keys and "" as value