Hide author on view if his profile page isn't visible

Bug 548021: Right now, the author is always displayed on a page, even if it is
publically shared. Suggestion: only show author, if the currently logged in
user (may be anonymous/not logged in) can see his profile page

Change-Id: I998e1395d3a5f8d167314862d6e1e4b83a7bdf4b
Signed-off-by: Tobias Zeuch <tobias.zeuch@kit.edu>
Merge "Hide author on view if his profile page isn't visible"