webdav: Allow propfind requests for specific properties
The handler for PROPFIND (in mod_webdav_subrequest_handler) treats a missing SQL database like a request with an empty body, which is a request for all available properties. So requesting just a single DAV property always returns all properties.
However even without an SQL database specific DAV properties may be requested. Therefore the attached patch removes the requirement to have an SQL database for PROPFIND.
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