Update virtualevent.md

Author: JarbasHorst

api-reference/beta/resources/virtualevent.md

@@ -34,7 +34,7 @@ Inherits from [entity](../resources/entity.md).
 |description|[itemBody](../resources/itembody.md)|A description of the virtual event.|
 |displayName|String|The display name of the virtual event. |
 |endDateTime|[dateTimeTimeZone](../resources/datetimetimezone.md)|The end time of the virtual event. The **timeZone** property _can_ be set to any of the time zones currently supported by Windows. For details on how to get all available time zones using PowerShell, see [Get-TimeZone](/powershell/module/microsoft.powershell.management/get-timezone#example-3-get-all-available-time-zones).|
-|externalEventInformation|[virtualEventExternalInformation](../resources/virtualeventexternalinformation.md) collection|The external information of a virtual event. Returned only for event organizers or coorganizers. |
+|externalEventInformation|[virtualEventExternalInformation](../resources/virtualeventexternalinformation.md) collection|The external information of a virtual event. Returned only for event organizers or coorganizers; otherwise, `null`. |
 |id|String|The unique identifier of the virtual event. Inherited from [entity](../resources/entity.md).|
 |settings|[virtualEventSettings](../resources/virtualeventsettings.md)| The virtual event settings. |
 |startDateTime|[dateTimeTimeZone](../resources/datetimetimezone.md)|Start time of the virtual event. The **timeZone** property _can_ be set to any of the time zones currently supported by Windows. For details on how to get all available time zones using PowerShell, see [Get-TimeZone](/powershell/module/microsoft.powershell.management/get-timezone#example-3-get-all-available-time-zones).|