fix segfault when setting 'proxy' to 'off'
fix segfault when setting 'proxy' to 'off'

fanglingsu/vimprobable,desyncr/vimprobable,desyncr/vimprobable,DeadDork/vimprobable2,hut/vimprobable,DeadDork/vimprobable2,fanglingsu/vimprobable,ThomasAdam/vimprobable,ThomasAdam/vimprobable,DeadDork/vimprobable2,hut/vimprobable,hut/vimprobable,DeadDork/vimprobable2,desyncr/vimprobable,desyncr/vimprobable,ThomasAdam/vimprobable,fanglingsu/vimprobable