#46 errormessage remains on screen

[Ivana]

In ops_admin, in the reporting tab, sometimes the errormessage remains on screen even when its no longer accurate.

Needs to be verified but when an attempt is made to retrieve a nonexisting timesheet an exception is thrown and the user gets a errormessage. If the next query is succesful, and the user reads the timesheetreport and then uses the back button to return to the reporttab, the errormessage is still there!