[Bug-apl] ⍋ on complex data

[Louis de Forcrand]

Grade-up on complex data yields nothing for me:

        J←0J1 1J0 1J1 ¯1J2
        ⍋J
        ⍴⍋J
        ⍴⍴⍋J
        J[⍋J]
        ⍴J[⍋J]
        ⍴⍴J[⍋J]
        3=⍴⍋J

No empty lines, nothing. Literally just nothing.

Thanks,
Louis