isPseudoCalendarCollection() and isCalendarCollection() used on possibly non CalDAVResource resources

[cdaboo@…]

There are some uses of isPseudoCalendarCollection() and isCalendarCollection() that may operate on a resource that is not a CalDAVResource and hence does not implement that method (resulting in an unhandled exception): report_common.applyToCalendarCollections is one example. These need to be changed to use the generic (and resource type safe) isPseudoCalendarCollectionResource() or isCalendarCollectionResource().

[cdaboo@…]

PS This was seen when a client attempted a calendar report on the principal hierarchy.