jlink: bad error if --plugins-configuration file does not exist.
Error: invalid path: {0} builder.cfg

Root cause:
TaskHelper.java, 288 line
getMessage("err.path.not.valid") + " " + pluginsProperties);
TaskHelper.java, 695 line
getMessage("err.path.not.valid") + " " + pluginOptions.pluginsProperties)

The getMessage message should be called with the parameters instead of string concatenation.