HTTP 401 Unauthorized responses don't contain a body

[individual-it]

accessing an OCS or WebDAV endpoint with invalid credentials returns an empty response.

In oC10 the ocs response is:

<?xml version="1.0"?>
<ocs>
 <meta>
  <status>failure</status>
  <statuscode>997</statuscode>
  <message>Unauthorised</message>
 </meta>
 <data/>
</ocs>

and the webDav response is:

<?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">
  <s:exception>Sabre\DAV\Exception\NotAuthenticated</s:exception>
  <s:message>No public access to this resource., Username or password was incorrect, No 'Authorization: Bearer' header found. Either the client didn't send one, or the server is mis-configured, Username or password was incorrect</s:message>
</d:error>

[PVince81]

to be discussed in https://github.com/owncloud/ocis-reva/issues/199

[refs]

closing as it's tracked here