fix biblio filter fault due to var unreffing
fix biblio filter fault due to var unreffing

tonyolag/gummi-vim,jmarshallnz/gummi,tonyolag/gummi-vim,jmarshallnz/gummi,tonyolag/gummi-vim,tonyolag/gummi-vim,jmarshallnz/gummi,jmarshallnz/gummi