three small changes to acid.

remove extraneous blank line here:
cpu% acid 169453
/proc/169453/text:386 plan 9 executable
    <<< this one!
/sys/lib/acid/port
/sys/lib/acid/386

fix unary + not to crash:
cpu% /n/sources/plan9/386/bin/acid
8.out:386 plan 9 executable

/sys/lib/acid/port
/sys/lib/acid/386
acid: +1
acid 169539: suicide: sys: trap: fault read addr=0x8 pc=0x000059f6

force printing of unary + expressions:
cpu% acid
8.out:386 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/386
acid: {}
acid: +{}
{}
acid: 

i could have sworn that this was a documented feature
that i was just restoring, but i can't find where i
saw it documented.