Problem description: The following error is observer in Problems by Severity widget with "Show suppressed problems" = true, if one of the problems to be displayed was manually suppressed, but the suppression period has already completed:

Undefined index: suppress_until [zabbix.php:22 → require_once() → ZBase->run() → ZBase->processRequest() → ZBase->processResponseFinal() → CView->getOutput() → include() → makeSeverityTotals() → getSeverityTableCell() → makeProblemsPopup() → isEventRecentlySuppressed() → CConfigFile->{closure}() in conf/zabbix.conf.php:112]
Undefined index: suppress_until [zabbix.php:22 → require_once() → ZBase->run() → ZBase->processRequest() → ZBase->processResponseFinal() → CView->getOutput() → include() → makeSeverityTotals() → getSeverityTableCell() → makeProblemsPopup() → CConfigFile->{closure}() in conf/zabbix.conf.php:112]

Steps to reproduce:

1. Open any dashboard in edit mode
2. Add a "Problems by severity" widget and set "Show suppressed problems" to true
3. Create a problem
4. Manually suppress this problem for 2-3 minutes
5. Wait until the suppression period is completed
6. Open the dashboard and check the previously created Problems by severity widget

Result: The above error is observed in the widget
Expected: no errors should occur.