code: public ESigItemIssue addIssue(ESigItemIssueSeverity severity, String description) {
          ESigItemIssue issue = new ESigItemIssue(severity, description);
          
          if (issues == null) {
              issues = new ArrayList<ESigItemIssue>();
              sortIssues = false;
          } else {
              int i = issues.indexOf(issue);
              
              if (i >= 0) {
                  return issues.get(i);
              }
              
              sortIssues = true;
          }
          
          issues.add(issue);
          return issue;
      }
docs: Adds an issue to the signature item.
  
  @param severity Severity of the issue.
  @param description Description of the issue.
  @return The added issue.