Test plan:
Turn on AnonSuggestion but set AnonymousPatron to an invalid value
Go to /cgi-bin/koha/opac-suggestions.pl?op=add
=> You see the login form
Signed-off-by: hc <hc@interleaf.ie>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>