Handle calendar-query with single VCALENDAR filter properly

[untitaker]

In order to fetch all items, ownCloud forces me to do the following:

<C:calendar-query xmlns:D="DAV:"
    xmlns:C="urn:ietf:params:xml:ns:caldav">
    <D:prop>
        <D:getetag/>
    </D:prop>
    <C:filter>
        <C:comp-filter name="VCALENDAR" />
    </C:filter>
</C:calendar-query>

However, Radicale doesn't like that. It prefers:

<C:calendar-query xmlns:D="DAV:"
    xmlns:C="urn:ietf:params:xml:ns:caldav">
    <D:prop>
        <D:getetag/>
    </D:prop>
    <C:filter>
    </C:filter>
</C:calendar-query>

How should i resolve this conflict?