/**
  * Check that the environment field is not empty.
  *
  * @param environment The name of the project.
  * @return Ok if not empty, error otherwise.
  */
 public FormValidation doCheckEnvironment(@QueryParameter String environment) {
   setGlobalConfiguration();
   environment = environment.trim();
   OctopusValidator validator = new OctopusValidator(api);
   return validator.validateEnvironment(environment);
 }