[bug]: One day event without DTEND in ICS-Calendar not recognized as valid

[lucasgirod]

FreePBX Version

FreePBX 17

Issue Description

According to RFC 5545 if a calendar event does not have a DTEND property it should be considered a one day event.

From RFC 5545
For cases where a "VEVENT" calendar component specifies a "DTSTART" property with a DATE value type but no "DTEND" nor "DURATION" property, the event's duration is taken to be one day.

Currently the one day event without DTEND is not recognized as valid event and not shown in the calendar at all.

Operating Environment

FreePBX 17.0.19.21
Calendar 17.0.4.20

Relevant log output

No response