In case of Web site access, add Content-Type to HEAD request.

This remove a necessity for another HEAD request when MediaType
is requested while accessing a Web site, a cleaner implementation of
d61352f5.

This behavior is active only on a standard Web site, when PROPFIND
failed earlier on the program flow, without retrieving the property
DAV:getcontenttype.

Change-Id: I60456f9ad8746c3cba3c070218243adef0c0dd01
Reviewed-on: https://gerrit.libreoffice.org/26605Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Giuseppe Castagno <giuseppe.castagno@acca-esse.eu>

ucb/source/ucp/webdav-neon/webdavcontent.cxx

@@ -1364,9 +1364,6 @@ uno::Reference< sdbc::XRow > Content::getPropertyValues(
 
         if ( bNetworkAccessAllowed )
         {
-            if( eType != DAV )
-                m_bDidGetOrHead = false;
-
             // All properties obtained already?
             std::vector< OUString > aMissingProps;
             if ( !( xProps.get()
@@ -1382,6 +1379,14 @@ uno::Reference< sdbc::XRow > Content::getPropertyValues(
                     rProperties,
                     aHeaderNames );
 
+                if( eType != DAV )
+                {
+                    // in case of not DAV PROFIND (previously in program flow) failed
+                    // so we need to add the only prop that's common
+                    // to DAV and NON_DAV: MediaType, that maps to Content-Type
+                    aHeaderNames.push_back( "Content-Type" );
+                }
+
                 if ( !aHeaderNames.empty() )
                 {
                     try