Fixes undefined array causing warnings to log.
Modifies method signature of Mapper\Talk.

- Adds $admin_user_id as first argument of getAdminFavorites.
- This is done because createdFormattedOutput method requires the $admin_user_id.

A possible refactor would split the formatting method in two depending
on use-case. However, this depends on intent and I'm not entirely comfortable
with the codebase enough to know what the right decision is.
Merge pull request #128 from mdwheele/fix-undefined-array-notice-warning

Fixes undefined array causing warnings to log.