fix: Chat message not found on refresh issue fix (#6990)
fix: Chat message not found on refresh issue fix (#6990)

If chat message is deleted then chat message not found error message is shown on refresh.

![chat message](https://user-images.githubusercontent.com/42651287/53424137-a55d1100-3a08-11e9-909f-1c585ddb416a.png)
saurabh6790/frappe,almeidapaulopt/frappe,vjFaLk/frappe,yashodhank/frappe,frappe/frappe,mhbu50/frappe,StrellaGroup/frappe,almeidapaulopt/frappe,saurabh6790/frappe,almeidapaulopt/frappe,mhbu50/frappe,mhbu50/frappe,mhbu50/frappe,yashodhank/frappe,StrellaGroup/frappe,adityahase/frappe,StrellaGroup/frappe,vjFaLk/frappe,vjFaLk/frappe,saurabh6790/frappe,adityahase/frappe,adityahase/frappe,frappe/frappe,adityahase/frappe,almeidapaulopt/frappe,saurabh6790/frappe,frappe/frappe,yashodhank/frappe,vjFaLk/frappe,yashodhank/frappe