If the .target of a .source/.target tuple is empty, we get a "//"
in the path. Let's replace it with a "/" before string-comparing
it to another path.

If the .target is just a "." like in the HTML template code, we get
to replace a "/./" with a "/".

Change-Id: I5b6fef93c3efd5a21f9461b6e85c76f13bfb75e1
Task-Id: QTBUG-21060
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Alessandro Portale <alessandro.portale@nokia.com>