code: private void checkForMissingCommandParameters(final List<String> messages) {
          if ((commandParams.isEmpty() || commandParams.iterator().next().startsWith("-"))
                  && (COMMANDS.CALCULATE_CHECKSUM.equalsIgnoreCase(command))) {
              messages.add(coreBundle.getString("changeset.identifier.missing"));
          }
      }
docs: Checks for missing command line parameters and, if any problems are found,
  returns the list of issues in String form.
  
  @param messages an array of Strings to which messages for issues found will be added