[Bug-apl] 8⎕CR on empty string array prints strange result

[Elias Mårtenson]

If I create an empty character array by selecting ⍬ from an array that
contains a string and a number, the result becomes what seems to be an
empty array with non-zero shape.

The issue can best be explain by the following interaction. Note the
strange output from 8⎕CR:

      a←('foo' 9)[⍬]
      b←''
      a≡b
0
      a
      b
      8⎕CR a
┌⊖──┐
│   │
└───┘
      8⎕CR b
┌⊖┐
│ │
└─┘
      ⍴a
0
      ⍴b
0


Regards,
Elias