Description of problem:
When two people working on the same workbench and one of them leaves, the "Participants" still shows two people.
Version-Release number of selected component (if applicable):
Zanata version 1.4.2 (20111031-0915).
Steps to Reproduce:
1. Two people log in and work on https://translate.zanata.org/zanata/project/view/katello
2. One exits the workbench
3. Observe the other's workbench
Fixed in 1.5. See https://github.com/zanata/zanata/commit/fa9a84d3c600e55f787133b62dae688da3b16029
*** Bug 785040 has been marked as a duplicate of this bug. ***
*** Bug 751915 has been marked as a duplicate of this bug. ***
Verified with Zanata version 1.5.0-alpha-2-SNAPSHOT (20120221-1409)