convert null to '' to keep in smf style
convert null to '' to keep in smf style

Signed-off-by: albertlast  <c4df20170357c0100af2ad4ef1b2087801e81af0@hotmail.de>

StealthWombat/SMF2.1-more-forkery,StealthWombat/SMF2.1-more-forkery