code: @Nullable
    public static <KEYTYPE, ENUMTYPE extends Enum <ENUMTYPE> & IHasID <KEYTYPE>> ENUMTYPE getFromIDOrNull (@Nonnull final Class <ENUMTYPE> aClass,
                                                                                                           @Nullable final KEYTYPE aID)
    {
      return getFromIDOrDefault (aClass, aID, null);
    }
docs: Get the enum value with the passed ID
  
  @param <KEYTYPE>
  The ID type
  @param <ENUMTYPE>
  The enum type
  @param aClass
  The enum class
  @param aID
  The ID to search
  @return <code>null</code> if no enum item with the given ID is present.