History in alert page should always include ALERT_ENTITY_ENDED and ALERT_ENTITY_STARTED

[JonSingh]

On occasion, when looking at an alert history page, ALERT_ENTITY_STARTED will not be displayed, only ALERT_ENTITY_ENDED.

Steps To Reproduce: Unknown

Observed results: ALERT_ENTITY-STARTED is not present
Expected results: Both STARTED and ENDED events are in the history.

[JonSingh]

This also looks like it can occur with entity_started events never having entity_ended events. See Screenshot.