added item.Comment() function to fix #293

[zeknox]

• added item.Comment() function to fix #293 and appears to be working well in testing

item.Comments.Add() would fail under conditions where Comments was nil and cause a panic and exit. Moved item.Comments.Add() to the function item.Comment() in an attempt to address this panic condition.

[hmsta]

I can confirm that this works

[ahmdrz]

Thank you.