send auto presence if user received 'unavailable' status from himself

[Vladlukhanin]

Make sure that you wrote the tests for your proposed changes and the existing test was success.

Made/Proposed changes:
(Don’t use general words, describe changes in details)

How should this be manually tested?

1. open app (Q-municate for example) in two browsers(or tabs) with same user (User_1);
2. open app in browser with other user (User_2);
3. close one app for User_1;
4. User_2 receive presence (type='unavialable') from User_1 because app was closed, but with this update User_2 instantly receive presence (type='avialable') from User_1 (wich is in other tab or browser)

It's helpfull for displaying online status for User_2 from User1

Does the documentation need an update?

• no