fix search empty form bug
fix search empty form bug

hsoft/slimbb,agepoly/DjangoBB,slav0nic/DjangoBB,rashoodkhan/DjangoBB,saifrahmed/DjangoBB,saifrahmed/DjangoBB,hsoft/slimbb,slav0nic/DjangoBB,LLK/s2forums,slav0nic/DjangoBB,hsoft/DjangoBB,tjvr/s2forums,hsoft/slimbb,tjvr/s2forums,rashoodkhan/DjangoBB,saifrahmed/DjangoBB,hsoft/DjangoBB,agepoly/DjangoBB,hsoft/DjangoBB,tjvr/s2forums,LLK/s2forums,agepoly/DjangoBB,LLK/s2forums