code: public IssueCategory getByID(String categoryID)
      {
          IssueCategory issueCategory = this.issueCategories.get(categoryID);
          if (issueCategory == null)
          {
              // We do not have this one yet, so store it as a placeholder. It will presumably be loaded later on.
              issueCategory = new IssueCategory(categoryID, "placeholder", categoryID, categoryID, 0, true);
              this.issueCategories.put(categoryID, issueCategory);
          }
          return issueCategory;
      }
docs: Gets an {@link IssueCategory} by ID.